Stoichiometry and gases

Question 1 of 10

A gas has a density of 1.43 g/dm³ at s.t.p. Its molar mass is about

Question 2 of 10

How many moles of oxygen are needed to burn 2 moles of CH₄ completely?

Question 3 of 10

25.0 cm³ of 0.10 mol/dm³ NaOH neutralises 20.0 cm³ of HCl. The concentration of the acid is

Question 4 of 10

A gas occupies 300 cm³ at 27 °C and 1 atm. Its volume at 127 °C and 2 atm is

Question 5 of 10

What volume of oxygen at s.t.p. is needed to burn 2 moles of hydrogen completely?

Question 6 of 10

The empirical formula of a compound with 40% C, 6.7% H and 53.3% O is

Question 7 of 10

The percentage of nitrogen in NH₄NO₃ (N = 14, H = 1, O = 16) is

Question 8 of 10

Find the percentage of nitrogen in NH₄NO₃. (N = 14, H = 1, O = 16)

Question 9 of 10

At constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure. This is

Question 10 of 10

Find the concentration of a solution containing 0.5 mol of solute in 250 cm³ of solution.