Potassium hydrogencarbonate (KHCO3\text{KHCO}_3KHCO3) is sometimes used as a leavening agent in baking. When heated, it undergoes thermal decomposition to release carbon dioxide gas according to the following equation:
2KHCO3→K2CO3+H2O+CO2 2\text{KHCO}_3 \rightarrow \text{K}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 2KHCO3→K2CO3+H2O+CO2Calculate the mass, in grams, of carbon dioxide that would be produced by completely decomposing 15.0 g of potassium hydrogencarbonate. [Mr M_r\,Mr of KHCO3=100\text{KHCO}_3 = 100KHCO3=100]
mass of carbon dioxide = _______________ g\text{g}g
Use your answer from part (a) to calculate the volume, in cm3\text{cm}^3cm3, at room temperature and pressure, of carbon dioxide that would be produced by completely decomposing 15.0 g of potassium hydrogencarbonate.
Assume one mole of carbon dioxide has a volume of 24 000 cm324\,000\text{ cm}^324000 cm3 at room temperature and pressure.
volume of carbon dioxide = _______________ cm3\text{cm}^3cm3
80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.