# 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

Subtopic:  Concentration Based Problem |
63%
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The mass of ammonia produced when 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen is:

 1 2338.11 g 2 2428.57 g 3 2712.24 g 4 2180.56 g
Subtopic:  Limiting Reagent |
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The total number of electrons present in 1.4 g of dinitrogen gas are -

1.

2.

3.

4.

Subtopic:  Moles, Atoms & Electrons |
61%
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The mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molars aqueous solution would be -

Molar mass(sodium acetate) = 82.0245 g/mol

1. 17.86g

2. 31.76g

3. 20.34g

4. 15.38g

Subtopic:  Moles, Atoms & Electrons |
68%
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If ${10}^{10}$ wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -

Subtopic:  Moles, Atoms & Electrons |
56%
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In sodium sulphate (Na2SO4), the mass percent of sodium, sulfur and oxygen is:

1. 32.4%, 45.05%, 22.6%

2. 22.6%, 45.05%, 32.4%

3. 32.4%, 22.6%, 45.05%

4. 45.05%, 32.4%, 22.6%

Subtopic:  Introduction |
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The amount of copper (in grams) that can be obtained from 100 g of copper sulphate (CuSO4is:

 1 54 2 39.81 3 63.5 4 159.5
Subtopic:  Moles, Atoms & Electrons |
70%
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In an iron oxide, the mass percent of iron and oxygen are 69.9 and 30.1, respectively. The empirical formula of the oxide of iron will be:

1. Fe3O2

2. Fe2O2

3. Fe2O3

4. Fe3O4

Subtopic:  Empirical & Molecular Formula |
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The average atomic mass of chlorine using the following data would be:

 Isotope % Natural Abundance Molar Mass 35Cl 75.77 34.9689 37Cl 24.23 36.9659

1. 38.4527 u

2. 37.4527 u

3. 36.4527 u

4. 35.4527 u

Subtopic:  Empirical & Molecular Formula |
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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

Subtopic:  Moles, Atoms & Electrons |
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