Mole Concept

Q.

The number of atoms present in 4.25 g of $\left({\mathrm{NH}}_3\right)$ is approximately.

a) $1\times {10}^{23}$

b) $1.5\times {10}^{23}$

c) $0.25\times {10}^{23}$

d) $6.02\times {10}^{23}$

Q.

Calculate the molecular mass of ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$.

Q.

What is the molar mass of Sodium hydroxide?

Q.

What is the molar mass of sulfuric acid ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Q.

How would you calculate the molar mass of water?

Q.

Explain Ostwalds dilution law.

Q.

What is the molar mass of carbon tetrachloride?

Q.

Calculate the no. of iron atoms present in one molecule of haemoglobin given that haemoglobin contains $0.33\%$ of iron by weight. the molecular weight of it is approx.$67200$

1. $1$

2. $2$

3. $4$

4. $6$

Q.

Aqueous solution of borax is

1. Neutral

2. Acidic

3. Alkaline

4. Strongly acidic

Q.

How many atoms are in $1$ mole of a substance?

Q.

The molality of an aqueous solution of Urea in which the mole fraction of Urea is $0.18$, is

Q.

How do you convert 1cc to mL?

Q.

Calculate the mass of 1 molecule of Nitrogen $\left({\mathrm{N}}_2\right)$. (Atomic mass of $\mathrm{N}=14$).

Q.

Why is 1 molar aqueous solution more concentrated than a 1 molal solution?

Q.

What is the molar mass of calcium hydroxide?

Q. How many moles of hydrogen atoms are present in one mole of water ($H_{2}O$)?

1. 2

Q.

Define equivalent mass.

Q.

1 amu is equal to $1.66\times {10}^{-24}\mathrm{g}$

1. True
2. False

Q.

Calculate mass of 0.5 mole of nitrogen gas?

Q.

Give the relationship between mole, mass and Avogadro number.

Q. The mass of 350 cubic cm of a diatomic gas at 273K at 2atm is 1g. calculate the mass of 1 atom of the gas

Q.

A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is

(IIT-JEE, 1979)

1. 1:4
2. 1:8
3. 3:16
4. 7:32

Q.

Calculate the mass of 1 atom of C14.

1. 2.324 $\times {10}^{-22}$ gm

2. 2.324 $\times {10}^{-21}$ gm

3. 2.324 $\times {10}^{-24}$ gm

4. 2.324 $\times {10}^{-20}$ gm

Q.

Calculate the molecular mass of:

Sodium sulphate decahydrate${\mathrm{Na}}_2{\mathrm{SO}}_4.10{\mathrm{H}}_2\mathrm{O}$.

Q.

What is the mass of 1 mole of water?

Q.

The formula for calculating the number of gram atoms is

1. Mass in grams GAM of the element
2. Number of moles GAM of the element
3. Mass in grams GMM of the element
4. Mass in grams Avogadro number

Q.

What is meant by solubility product?

Q.

The normality of $0.3\text{m}$ phosphorous acid is ___?

Q.

What is the mass of $\text{0.5}$ moles of ozone molecules?

1. $8\text{g}$

2. $16\text{g}$

3. $24\text{g}$

4. $48\mathrm{g}$

Q.

Calculate the number of moles of the following:

(i) 52 g of He (ii) 12·044 x ${10}^{23}$ atoms of He