What is the molarity of a solution consisting of 105 grams of calcium nitrate and 280. grams of water?

Answers

Answer 1

Answer:

About 2.29 M.

Explanation:

Recall that molarity is defined by moles of solute over liters of solution.

Our solute is 105 grams of calcium nitrate (Ca(NO₃)₂)).

Convert 105 grams of Ca(NO₃)₂ to moles. The molecular weight of Ca(NO₃)₂ is 164.10 g/mol:

[tex]\displaystyle 105\text{ g Ca(NO$_3$)$_2$}\cdot \frac{1\text{ mol Ca(NO$_3$)$_2$}}{164.10\text{ g Ca(NO$_3$)$_2$}} = 0.640\text{ mol Ca(NO$_3$)$_2$}}[/tex]

Convert 280. grams of water to liters. Recall that the density of water is given by 1.00 g/mL:

[tex]\displaystyle \begin{aligned} D & = \frac{m}{V} \\ \\ V & = \frac{m}{D} \\ \\ & = \frac{(280.\text{ g})}{\left(\dfrac{1.00\text{ g}}{1\text{ mL}}\right)} \\ \\ & = 280. \text{ mL}\cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.280\text{ L soln.}\end{aligned}[/tex]

Hence, the molarity of the solution is:
[tex]\displaystyle \begin{aligned} \text{M} &= \frac{\text{ mols solute}}{\text{L soln.}} \\ \\ & = \frac{(0.640\text{ mol})}{(0.280\text{ L soln.})} \\ \\ & = 2.29\text{ M} \end{aligned}[/tex]

In conclusion, the solution is about 2.29 M.


Related Questions

Which of the following ionic compounds has a transition metal in it?
a. KOH
b. Cs2S
c. CuSO4
d. MgCl2

Answers

Answer:

Ca2s that is answers and CuSO4is

The pressure of a gas sample at 60.0 °C is decreased from 3.40 atm to 2.60 atm by cooling at a constant volume. What is the temperature (in °C) of the gas at 2.60 atm?

Answers

When the pressure of a gas is decreased from 3.40 atm to 2.60 atm, the temperature of the gas will decrease from 60.0 degree celsius to 45.88 degree celsius.

What is Gay-Lussac law?

Gay -Lussac law states that the pressure and temperature is in direct proportions. Thus, pressure increases with an increase in temperature. The relation can be mathematically expressed as follows:

P/T = a constant. Hence,

P1/T1 = P2/T2

The initial pressure of the sample is given, 3.46 atm and the initial temperature is 60 °C. The final temperature of the gas when gas the expand to the lower pressure of 2.60 atm is calculated as follows:

[tex]T_{2} = \frac{P_{2}T_{1}}{P_{1}}[/tex]

    = (60 °C× 2.60 atm) / 3.40 atm

    = 45.88 °C.

Hence, the final temperature of the gas which is expanded from the pressure of 3.40 atm to 2.60 atm with an initial temperature of 60 °C is  45.88  °C.

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polease help 20pts
chemistry redox

Answers

Answer:

A is mg because it is losing 2 electrons

B is N2

C Mg as oxidation is lose of electrons

D is N2 as reduction is gain of electrons

Explanation:

you can easily remember as OIL RIG in term of electrons as Oxidation is Lost of electrons. Reduction is Gain of electrons.

What is the equilibrium constant for the reaction at 644 K ?

Answers

What is the equilibrium constant for the reaction at 644 K ? What is the equilibrium constant for the reaction at 644 K ? The equilibrium constant, Kfor the following reaction is 1.55x0 at 644 When a sufficientiy large sample of HI(g) is introduced into an evacuated vessel at 644 K, the equilibrium concentration of I2)s found to be 0.303 M Calculate the concentration of HI in the equilibrium mixture. more group attempts remaining Submit Anawer Retry Entire Group Consider the following reaction where K 0.159 at 723 K. A reaction mixture was found to contain 2.07x102 moles of N2), 4.45x10-2 moles of H2) and 6.80x10-* moles of NH3() in a 1.00 liter container. Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium? The reaction quotient,equals The reaction A. must run in the forward direction to reach equilibrium. B. must run in the reverse direction to reach equilibrium. Submit Anawer Retry Entre Group more group attempte remalining

The solubility of a gas is 0.890 g/L at a pressure of 120 kPa. What is the solubility of the gas if the pressure is changed to 100 kPa, given that the temperature is held constant?

Answers

The solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L

Effect of Pressure on Solubility

As the pressure of a gas increases, the solubility increases, and as the pressure of a gas decreases, the solubility decreases.

Thus, Solubility varies directly with Pressure

If S represents Solubility and P represents Pressure,

Then we can write that

S ∝ P

Introducing proportionality constant, k

S = kP

S/P = k

∴ We can write that

[tex]\frac{S_{1} }{P_{1} } = \frac{S_{2} }{P_{2} }[/tex]

Where [tex]S_{1}[/tex] is the initial solubility

[tex]P_{1}[/tex] is the initial pressure

[tex]S_{2}[/tex] is the final solubility

[tex]P_{2}[/tex] is the final pressure

From the given information

[tex]S_{1} = 0.890 \ g/L[/tex]

[tex]P_{1} = 120 \ kPa[/tex]

[tex]P_{2} = 100 \ kPa[/tex]

Putting the parameters into the formula, we get

[tex]\frac{0.890}{120}=\frac{S_{2}}{100}[/tex]

[tex]S_{2}= \frac{0.890 \times 100}{120}[/tex]

[tex]S_{2}= 0.742 \ g/L[/tex]

Hence, the solubility of the gas if the pressure is changed to 100 kPa is 0.742 g/L

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help me with this pleaseeeeeee

Answers

Magnesium oxide is an ionic compound with a very high melting point and which requires a large amount of energy for melting.

What are ionic compounds?

Ionic compounds are compounds which are formed between oppositely charged ions which are held together by electrostatic forces of attraction between the oppositely charged ions.

Ionic compounds are formed when metal atoms donate electrons to non-metals atoms to form ions.

Magnesium oxide is an ionic compound.

The nature of bonding is ionic bonding.

It has a crystalline lattice structure.

The forces of attraction is electrostatic forces of attraction.

It has a high melting point of 2,852 °C, and thus requires a large amount of energy go melting to occur.

Therefore, magnesium oxide is an ionic compound which requires a large amount of energy for melting.

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What is a trade-off?




Don't mind the highlighted yellow circle

Answers

Answer:

a new scientific discovery that benefits the environment

Why is it possible to compress a gas

Answers

Answer:

Gas can be compress easily than liquid or solid because, molecules are more spread in gas than solin or liquid.

Brainliest if this helps you. please

Uranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian time? please help im lost on this and its due tomorrow!

Answers

Uranium-235 which has a half-life of 713 million years will best suited in dating a fossil from Precambrian time.

What is a Fossil?

Thi8s is defined as a trace of an animal or plant of a past geologic age that has been preserved in Earth's crust.

The Precambrian time occurred around 4.6 billions years ago and Uranium-235 which having a half-life of 713 million years means it's more useful when compared to carbon-14 which has a half life of 5,370 years.

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What is the molarity of a 250. mL H, SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution?
F) 0.800M
G)1.25M
H)125M
J)500. M

Answers

The molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.

How to calculate molarity?

The molarity of a solution can be calculated using the following expression:

CaVa = CbVb

Where;

Ca = concentration of acidCb = concentration of baseVa = volume of acidVb = volume of base

In this question;

Ca = ?Va = 250mLCb = 10MVb = 20mL

Ca × 250 = 10 × 20

250Ca = 200

Ca = 200/250

Ca = 0.8M

Therefore, the molarity of a 250. mL H2SO4 solution that was made from a 20.0 mL of a 10.0 M stock solution is 0.8M.

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Can someone please help me? :(

Answers

Answer:

A. Each type of cell carries out a specific function for the organism.

Explanation:

[tex]hope[/tex] [tex]this[/tex] [tex]helps![/tex] [tex]:)[/tex]

Elaborate on the method used to extinguish each class of fire

Answers

All fires can be extinguished by cooling, smothering, starving or by interrupting the combustion process to extinguish the fire.

The state of matter represented on the right (letter D) has the
highest energy. Of the four choices shown, which is plasma?

B. B.

A. A

D. D

С. С

Answers

Answer:

A is the answer.

Explanation:

gorgeousness

Describe the change of state using kinetic theory​

Answers

Explanation:

According to kinetic molecular theory,changes of the state of matter occur when energy is added or removed from a substance

According to the Kinetic-Molecular Theory, changes of the state of matter occur when energy is added or removed from a substance. The addition of energy makes particles move more, pushing them apart and weakening the bonds between them. Removing energy makes particle movement slow down, re-forming the bonds.

What is the mode of action of sulfonamides?

inhibition of protein synthesis

inhibition of cell wall synthesis

disruption of folic acid synthesis

disruption of membrane structure

Answers

Answer:

b is the correct answer inhibition of cell wall

Hey there!

Sulfanilamide is the classification of the antibiotics that can target the bacteria that’s causing infections.


But the action of the mode of sulfanilamide is: binding of a specific enzyme which simply translates to inhibition of the cell wall


Thus, your answer is: inhibition of cell wall synthesis (Option B.)


Good luck on your assignment & enjoy your day!



~Amphitrite1040:)


How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?.

Answers

Answer:

In fact, the inhibitor and substrate don't affect one another's binding to the enzyme at all. However, when the inhibitor is bound, the enzyme cannot catalyze its reaction to produce a product. Thus, noncompetitive inhibition acts by reducing the number of functional enzyme molecules that can carry out a reaction.

what is density/ how does density work

help help ​

Answers

Answer:

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Explanation:

Answer:

The mass per unit volume of a substance is called density of that substance.

Explanation:

So, How does it works ?

For example: Density of gold is 19300kg/cubic meter. It means that if there gold having volume of a cubic meter its mass will be 19300 kg... Density of plastics are less than that of density of metals... I.e. if we take plastic having volume 2 cubic meter & gold having volume 1 cubic meter we will find mass of gold is far more compared to that of plastic.. Thus, density refers how much tightly the molecules of a substance are bonded together.

A metal (FW 311.8 g/mol) crystallizes into a face-centered cubic unit cell and has a radius of 2.86 Angstrom. What is the density of this metal in g/cm3

Answers

For a metal crystallizes into a face-centered cubic unit cell and has a radius of 2.86 Angstrom, the density  is mathematically given as

d=3.31g/cm

What is the density of this metal in g/cm3

Generally, the equation for the density  is mathematically given as

[tex]d=\frac{2*m}{NA*a^3}\\\\Therefore\\\\d=\frac{2*295.6mol}{6.022*10^23*(6.67*10^{-3})}[/tex]

d=3.31g/cm

In conclusion, the density of this metal

d=3.31g/cm

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Select all of the following which are Nitrogenous bases that make up DNA:

a)Glutamine

b)Thymine

c)Adenine

d)Thyrine

e)Guanine

f)Cytosine

Answers

Answer:

adenine (A, green), thymine (T, red), cytosine (C, orange), and guanine (G, blue).

Explanation:

The nitrogen bases in a DNA molecule are adenine, guanine, cytosine, and thymine. Adenine and guanine belong to a class of compounds called purines, and cytosine and thymine belong to a class of compounds called pyrimidines. In a DNA molecule, the two strands are connecting by hydrogen bonds between the nitrogen bases of each strand. According to the base-pairing rule, the purine adenine always pairs with the pyrimidine thymine, and the purine guanine always pairs with the pyrimidine cytosine...

What is the molarity of NaCl when 5.0 moles of NaCl is dissolved in 2.0 L solution

Answers

Answer:

Molarity having mol/L that is moles of solute in per liters of solution.

mark as Brainliest please

Explanation:

substituted and expected value in the above education molarity equal to 0.5 mole by 2.0

7.25 moles of air are pumped into a car tire. At 80°C, the pressure inside the tire is 506.625
kPa. What is the volume of the tire?

Answers

For this question you need to use the ideal gas equation PV = nRT.

P is pressure, V is volume, n is number of moles, R is molar gas constant (8.31J/mol*K) and T is temperature.

The temperature must be in Kelvin for this equation, 80°C in kelvin is (80 + 273.15) = 353.15K

We also want to convert the kPa into Pa so we times by 1000 giving us 506625Pa

Since we’re looking for volume we rearrange to make V the subject giving us V = nRT/P.

Now you just plug in the values, V = 7.25 * 8.31 * 353 / 506625 which will give us 0.042m^3.

Hope this helps

The solubility of a gas is 0.890 g/L at a pressure of 120 kPa. What is the solubility of the gas if the pressure is changed to 100 kPa, given that the temperature is held constant?

Answers

For the solubility of a gas is 0.890 g/L at a pressure of 120 kPa, the solubility of the gas, if the pressure is changed to 100 kPa is mathematically given as

c=0.741g/l

What is the solubility of the gas if the pressure is changed to 100 kPa, given that the temperature is held constant?

Generally, the equation for the Pressure   is mathematically given as

p=kc

Therefore

k=p/c

k = 120 /0.890

k=134.8

In conclusion, if p=100kpa

c=p/k

c=100/134.8

c=0.741g/l

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HELP PLS (IT IS NOT THE THIRD ONE)

Answers

Answer:

A. would be your answer

Explanation:

Decomposers are especially important in retaining nutrients in their cells thus preventing loss of those nutrients from the root zone.

In an ecosystem, the decomposing web is important because decomposers help remove waste and use that energy to provide food for other animals.

What is an ecosystem?

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass  which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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what are difference between graphite and diamond​

Answers

Diamond and graphite are allotropes of carbon. These have different chemical and physical properties. The main difference between diamond and graphite is that diamond is made out of sp3 hybridized carbon atoms whereas graphite is made out of sp2 hybridized carbon atoms.

Answer:

[tex]Diffrence \: between \: graphite \: and \: diamond [/tex]

[tex]\qquad \huge{\sf{point \: 1}} ➫[/tex]

⇛Graphite is soft in nature

⇛Diamond is hardest substance

[tex]\qquad \huge{\sf{point \: 2}} ➫[/tex]

⇛Graphite is a good conductor

⇛Diamond is not a conductor

[tex]\qquad \huge{\sf{point \: 3}} ➫[/tex]

⇛Graphite is grey in colour

⇛Diamond have transperant look

[tex]\qquad \huge{\sf{point \: 4}} ➫[/tex]

⇛Graphite have SP² hybridization

⇛Diamond have SP³ hybridization

[tex]\qquad \huge{\sf{point \: 5}} ➫[/tex]

⇛Graphite have layered structure

⇛Diamond have crystalline structure

The graph above shows the titration curve that resulted when a sample of 0.1 M monoprotic acid was titrated with a solution of NaOH. Based on the graph, the pKa of the acid is closest to

(A) 3.0
(B) 4.0
(C) 6.0
(D) 8.0
(E) 12.0

Answers

Based on the titration curve of the monoprotic acid, pKa of the monoprotic acid is closest to 8.0.

What is a titration curve of acid?

A titration curve of an acid is a curve obtained from the plot of the pH against the amount of base added.

The titration curve of an acid reveals its pKa.

The pKa corresponds to the midpoint of titration when equal concentrations of the acid and base have reacted.

From the titration curve above, the pKa of the monoprotic acid is closest to 8.0.

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What can you conclude about the relationship between height and energy?​

Answers

Answer:

Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.

The question is given in the image below

Answers

2C2H2 + 6O2 -> 4CO2 + 2H2O + heat

Ferrous ammonium sulfate is what kind of test method.

Answers

Two things

Ferrous Ammonium Sulfate is a pale green or blue-green powder or sand-like solid. It is used in photography, analytical chemistry, and Iron-plating baths.

An FAS-DPD titration is as simple as a test for total alkalinity or calcium hardness. A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test.

Hope this it gang

A FAS-DPD titration is as simple as a test for total alkalinity or calcium hardness. A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test.

In which method ferric ammonium sulphate is used as an indicator?

Chemical analysis is the name of the method when ferric ammonium sulphate is used as the indicator. Basically, this method is used in the making of pharma elements. It is used in standardizing the formulation.

What is a DPD test?

The DPD test is used extensively in water treatment to determine the level of disinfectant present. In most cases, this is Free Chlorine but it can be used to measure other parameters ( oxidants ). It is a quick and relatively easy test which requires little background or skill to perform.

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Please help me for this

Answers

Answer:

it says tick the box next to the correct answer so it'd be right to tick the last box:

The particles of the gas slow down

The weak ionization constant (Ka)
for HF is equal to:
[H3O][F]
[HFJ[H20]
[HF]
[F-][H30+]
Please help

Answers

Answer:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

Explanation:

Write the reaction of HF (a weak acid) with water:
[tex]\displaystyle \text{HF}_\text{(aq)} + \text{H$_2$O}_\text{($\ell$)} \rightleftharpoons \text{H$_3$O}^+_\text{(aq)} + \text{F}^-_\text{(aq)}[/tex]

Recall that the equilibrium constant expression for an equilibrium reaction is the product of the concentration of the products over the product of the concentration of the reactants raised to their respective coefficients.

The equilibrium constant expression for this equation will hence be:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

Note that pure solids and liquids are not included in the equilibrium expression.

In conclusion:

[tex]\displaystyle K_a = \frac{[\text{H$_3$O}^+][\text{F}^-]}{[\text{HF}]}[/tex]

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