The mass of sodium acetate (CH₃COONa) required to make 500 mL of 0.375 molar aqueous solution would be -

Molar mass(sodium acetate) = 82.0245 g/mol

1. 17.86g

2. 31.76g

3. 20.34g

4. 15.38g

The concentration of 69% nitric acid (by mass) in a sample with a density of 1.41 g / mL will be-

1. 15.44 mol/L

2. 17.14 mol/L

3. 20.06 mol/L

4. 12.26 mol/L

The mass of ammonia produced when 2.00 × 10³ g dinitrogen reacts with 1.00 ×10³ g of dihydrogen is: 

What is the number of electrons present in 1.4 g of dinitrogen gas ?

1. \(6 . 023   \times   10^{23}\)

2. \(8 . 416   \times   10^{22}\)

3. \(4 . 214   \times   10^{23} \)

4. \(3 . 927   \times   10^{24}\)

If ${10}^{10}$ wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -

$1.<mspace\; width="1em"></mspace>1.91<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^6<mspace\; width="1em"></mspace>\mathrm{years}$
$2.<mspace\; width="1em"></mspace>2.31<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^4<mspace\; width="1em"></mspace>\mathrm{years}$
$3.<mspace\; width="1em"></mspace>3.84<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^{6<mspace\; width="1em"></mspace>}\mathrm{years}$
$4.<mspace\; width="1em"></mspace>1.91<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^5<mspace\; width="1em"></mspace>\mathrm{years}$

Calculate the mass percentages of sodium (Na), sulfur (S), and oxygen (O), respectively, in sodium sulfate (Na₂SO₄).

1. 32.4%, 45.05% and 22.6%

2. 22.6%, 45.05% and 32.4%

3. 32.4%, 22.6% and 45.05%

4. 45.05%, 32.4% and 22.6%

The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO₄) is:

1. Fe₃O₂

2. Fe₂O₂

3. Fe₂O₃

4. Fe₃O₄

The average atomic mass of chlorine using the following data would be:

1. 38.4527 u

2. 37.4527 u

3. 36.4527 u

4. 35.4527 u

The number of moles of hydrogen atoms present in 3 moles of ethane (C₂H₆), will be-

1. 18.069 × 10²³

2. 1.8 × 10²³

3. 18

4. 6 × 10²³