# Molarity

## Trending Questions

**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 $mL_{−1}$ ?

**Q.**How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3?

(The concentrated acid is 70 % HNO3 by weight)

- 90 g
- 45 g
- 70 g
- 54 g

**Q.**

**QUESTION 2.6**

How many mL of 0.1 M HCl are required to react completely with 1 g mixture of

Na2CO3 and

NaHCO3 containing equimolar amounts of both?

**Q.**

The density of 3 molal sodium thiosulphate solution is ^{}1.25g/cm3. 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:

$0.2$

$6.6$

$0.02$

$0.06$

**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 2.165×10

^{3}kgm

^{-3}while its X-rays density is 2.178×10

^{3}kgm

^{-3}. The fraction of unoccupied sites in sodium chloride crystal is

[CBSE PMT 2003]

- 5.96

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

- 6.023×1020
- 6.023×1023
- 6.023×1022
- 6.023×1021

**Q.**

The density of 3 molal solution of NaOH is 1.110 g mL−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?

- 10−1 M
- 10−2 M
- 10−4 M
- 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)

- 0.1 M
- 0.5 M
- 0.2 M
- 1M

**Q.**

What is the molarity of H_{2}SO_{4 } solution that has a density of 1.84 g/cc and contains 98% by mass of H_{2}SO_{4 }

**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 AgNO3 and 0.1 M NaCl are mixed together

- 0.1 M
- 0.2 M
- 0.05 M
- 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×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 mL of it is required to neutralize 25 mL of a 0.3096 M HCl solution?

- 0.25 M
- 0.50 M
- 4.0 M
- 2.5 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?

$5\mathrm{M}$

$0.5\mathrm{M}$

$0.005\mathrm{M}$

$50\mathrm{M}$

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

- A first order reaction can be catalysed; a second order reaction cannot be catalysed
- The half-life of a first- order reaction doe not depend on [A0]; the half-life of a second - order reaction depend on [A0]
- 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
- 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