Molarity

Q.

QUESTION 2.4

Concentrated nitric acid used in laboratory work is $68\%$ nitric acid by aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL−1mL^{-1}mL−1 ?

Q. How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $HN{O}_3$?
(The concentrated acid is 70 % $HN{O}_3$ by weight)

1. 90 g
2. 45 g
3. 70 g
4. 54 g

Q.

QUESTION 2.6

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of and containing equimolar amounts of both?

Q.

The density of 3 molal sodium thiosulphate solution is ^​​​​​$1.25g/c{m}^3$. The mole fraction of sodium thiosulphate is

Q. Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g /mL.Volume of acid required to make one litre of 0.1M H2SO4 solution will be??

Q.

If the density of methanol is $0.793\mathrm{kg}/\mathrm{L}$, what is its volume needed for making $2.5\mathrm{L}$of its$0.25\mathrm{M}$solution?

Q.

Calculate the mass of Sodium acetate to make 500ml of 0.375 molar aqueous solution. The Molar Mass is 82.0245g/mol.

Q.

Commercial available concentrate HCl contain 38percent HCl by mass. What is the molarity of this solution. Density is 1.19g per cm3

Q. What volume of 95% sulphuric acid (density =1.85g/cm³) and what mass of water must be taken to prepare 100cm³ of 15% solution of sulphuric acid (density = 1.0g/cm³) ?

Q.

$20\mathrm{ml}$ of $0.2\mathrm{M}$ ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$ is mixed with $20\mathrm{ml}$ of $6.6\mathrm{M}$ ${\mathrm{BaCl}}_2$ , the concentration of ${\mathrm{Cl}}^{-}$ ion in solution is:

1. $0.2$

2. $6.6$

3. $0.02$

4. $0.06$

Q. Calculate the freezing of an aqueous solution containing 10.50g of mgbr2in 200g of water

Q. The pyknometric density of sodium chloride crystal is 2.165×10³ kgm^-3 while its X-rays density is 2.178×10³ kgm^-3. The fraction of unoccupied sites in sodium chloride crystal is

[CBSE PMT 2003]

1. 5.96

2. 
   

3. 
   

4. 
   

Q. Calculate the number of oxalic acid molecules in $100mL$ of $0.02N$ oxalic acid.

1. $6.023\times {10}^{20}$
2. $6.023\times {10}^{23}$
3. $6.023\times {10}^{22}$
4. $6.023\times {10}^{21}$

Q.

The density of 3 molal solution of NaOH is $1.110gm{L}^{-1}$. Calculate the molarity of the solution.

Q.

What is the molecular weight (mass) for $\text{KOH}$?

Q. What is the molarity of an $NaOH$ solution if 250 mL contains 1 mg of $NaOH$?

1. ${10}^{-1}M$
2. ${10}^{-2}M$
3. ${10}^{-4}M$
4. ${10}^{-3}M$

Q.

QUESTION 2.3 (I)

Define the following term:

(i) Mole fraction

(ii) Molality

(iii) Molarity

(iv) Mass percentage

Q.

Calculate the number of moles of methanol in 5 liters in 2m solution.

Q.

How many grams of does an atom of hydrogen weight?

Q. The molarity of the solution containing 2.8% (m/v) solution of KOH is (Given atomic mass of K = 39 u)

1. 0.1 M
2. 0.5 M
3. 0.2 M
4. 1M

Q.

What is the molarity of H₂SO₄ solution that has a density of 1.84 g/cc and contains 98% by mass of H₂SO₄

Q.

Nitric acid is 68% by weight and density of solution is 1.504 g/ml

Calculate Molarity

Q. What is the concentration of nitrate ions if equal volumes of 0.1 M $AgN{O}_3$ and 0.1 M NaCl are mixed together

1. 0.1 M
2. 0.2 M
3. 0.05 M
4. 0.25 M

Q.

How do you calculate moles of solute?

Q. 100 g of propane is completely reacted with 1000g of oxygen.The mole fraction of carbon dioxide in the resulting mixture is $x\times {10}^{-2}$.The value of 'x' is (Rounded off to the nearest integer) is
[Atomic weight :H=1.008;C=12.00;O=16.00]

Q. What is the molarity of a barium hydroxide solution if $15.48\text{mL}$ of it is required to neutralize $25\text{mL}$ of a $0.3096\text{M}HCl$ solution?

1. $0.25\text{M}$
2. $0.50\text{M}$
3. $4.0\text{M}$
4. $2.5\text{M}$

Q.

Question 39
Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.

Q.

If the concentration of glucose in blood is $0.9\mathrm{g}{\mathrm{L}}^{-1}$, what will be the molarity of glucose in blood?

1. $5\mathrm{M}$

2. $0.5\mathrm{M}$

3. $0.005\mathrm{M}$

4. $50\mathrm{M}$

Q. The correct difference between first and second-order reaction is that:

1. A first order reaction can be catalysed; a second order reaction cannot be catalysed
2. The half-life of a first- order reaction doe not depend on $\left[A_0\right]$; the half-life of a second - order reaction depend on $\left[A_0\right]$
3. The rate of a first-order reaction does not depend on reaction concentrations; the rate of a second order reaction does depend on reactant concentrations
4. The rate of a first-order reaction does depend on reactant concentration; the rate of a second order reaction does not depend on reactant concentrations.

Q.

Calculate the volume of the 80% h2so4 by weight density 1.8 /mol required to prepare 1L of 0. 2 M solution