Question

15cm^3 of hydrogen are sparked with 10cm^3 of oxygen at atmospheric pressure in eudiometer.what is the total volume of the residual gas at room temperature

Answer 1

Explanation:

2H2+O2→2H2O n = V/22.4 n = m/M n (H2) = 15/22.4 = 0.7 mmol n (O2) = 10/22.4 = 0.5 mmol According to equation above, n (H2) = 2 x n (O2) or n (O2) = n (H2) / 2. Therefore, Hydrogen will react fully. The remaining amount of O2 will be: n (O2) = 0.5 – (0.7/2) = 0.15 mmol V (O2) = 0.15 × 22.4 = 3.36 cm³