When a mixture of sodium chloride and sodium hydrogencarbonate is heated, the reaction shown takes place. 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Sodium chloride is unchanged on heating. When 6.0 g of the mixture is heated, the loss in mass is 1.5 g. What is the percentage by mass of sodium hydrogencarbonate in the mixture? [relative molecular mass, Mr: NaHCO3, 84; Na2CO3, 106; CO2, 44; H2O, 18]

The equation for the burning of hydrogen in oxygen is shown. 2H2(g) + O2(g) → 2H2O(g) What does this equation indicate?

For which molecules are the empirical and molecular formulae the same? 1. methanoic acid, HCO2H 2. ethanoic acid, CH3…

A 10 cm³ sample of a gaseous hydrocarbon is completely burnt in oxygen. The total volume of the products is 70 cm³. A…

An alloy of copper and zinc is added to an excess of dilute hydrochloric acid. Which observations are correct?

From your knowledge of the manufacture of both aluminium and iron, what is the order of chemical reactivity of alumin…

Which compound will not produce ammonia when heated with ammonium sulfate?