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 |
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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 |
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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. 6.023 × 1023 electrons

2. 8.416 × 1022 electrons

3. 4.214 × 1023 electrons

4. 3.927 × 1024 electrons

Subtopic:  Moles, Atoms & Electrons |
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If 1010 wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -

1. 1.91 × 106 years2. 2.31 × 104 years3. 3.84 × 106 years4. 1.91 × 105 years

Subtopic:  Moles, Atoms & Electrons |
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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 sulfate (CuSO4)is 

1. 54.00

2. 39.81

3. 63.50

4. 159.50

Subtopic:  Moles, Atoms & Electrons |
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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 x 1023

2. 1.8 x 1023

3. 18

4. 6 x 1023

Subtopic:  Moles, Atoms & Electrons |
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