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 total number of electrons present in 1.4 g of dinitrogen gas are:

1. \(6 . 023   \times   10^{23} \text{ electrons}\)

2. \(8 . 416   \times   10^{22} \text{ electrons}\)

3. \(4 . 214   \times   10^{23}   \text{ electrons}\)

4. \(3 . 927   \times   10^{24} \text{ electrons}\)

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

$1. 1.91 \times {10}^6 \mathrm{years}$
$2. 2.31 \times {10}^4 \mathrm{years}$
$3. 3.84 \times {10}^{6 }\mathrm{years}$
$4. 1.91 \times {10}^5 \mathrm{years}$

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

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

Which will have the largest number of atoms among the following?

1. 1 g Au (s)

2. 1 g Na (s)

3. 1 g Li (s)

4. 1 g of Cl₂(g)

The mass of one ¹²C atom in g is:

1. 1.393 x 10^-23

2. 1.993 x 10^-23

3. 1.773 x 10^-23

4. 1.593 x 10^-23

The highest number of atoms is present in -

1. 52 moles of Ar

2. 52 u of He

3. 52 g of He.

4. All of the above have the same number of atoms