Calculate mass in gram of two atom of carbon.

Ans: (i) 3.98 x 10^-23 g carbon

How many numbers of moles of CO will be left when 2 x 10²¹ molecules are removed from 0.28g of CO?

Ans: 6.68 x 10²³

Mass of 2 x 10²¹ number of atoms of an element is 0.4g. What is the mass of 0.5 mole of the element?

Ans: 60.22g

Mass of 3.011 x 10²² molecules a gaseous substance is 22g. Calculate the volume of 33g of the gas at NTP.

Ans: 1.68 L

How many number of hydrogen atoms are present in:

1. 64 amu of methane
2. 4.5g of water ?

Ans: (i) 9.69 x 10²⁴ (ii) 3.011 x 10²³

What mass of nitrogen will be required to produce 6.022 x 10²⁴ molecules of ammonia by the following reaction?

N₂ + 3H₂ => 2NH₃

Ans: 1.4 x 10⁴⁸g

How many number of oxygen molecules are required to produce 220 mg of CO₂according to the reaction?

C + O₂ => CO₂

Ans: 3.011 x 10²¹ O₂

Calculate the number of hydrogen and oxygen molecules in a solution prepared by mixing 45g of glucose in 36g of water.

Ans: H₂ = 2.1077 x 10²⁴ , O₂ = 1.05385 x 10²⁴

How many grams of sulphur and oxygen are needed to produce 6.022 x 10²⁴ molecules of SO₂ according to the reaction?

S + O₂ => SO₂

Ans: 320g sulphur and 320g oxygen

Calculate mass in gram of three molecules of hydrogen.

Ans: 9.96 x 10^-24 g

Why one has higher mass and why?0.5 mole of CO₂ or 16g of SO₂.2g of hydrogen or 6.023 x 10²¹ number of oxygen molecules.

Ans: (a) 0.5 mol of CO₂ (b) 2g of H₂

Calculate the number of molecules of hydrogen and carbon present in 4g of methane.

Ans: H₂ = 3.011 x 10²³ ; C = 1.5 x 10²³

Calculate the mass of 4 atom of carbon

Ans: 7.97 x 10^-23

The cost of per mole of sugar (C₁₂H₂₂O₁₁) is Rs. 20. How much a pocket of sugar containing 2 kg would cost?

Ans: Rs. 116.95

Calculate the mass of carbon monoxide having the same number of oxygen atoms as are present in 88g of carbon dioxide.

Ans: 56g CO