Conservation Of Mass And Balanced Chemical Equations (GCSE Chemistry)

Which statement best describes the law of conservation of mass in a chemical reaction?

When 100 g of calcium carbonate (CaCO3) decomposes completely to calcium oxide (CaO) and carbon dioxide (CO2) in a closed container, the mass of the products will be:

When 2.00 mol of hydrogen reacts completely with 1.00 mol of oxygen to form water, what mass (g) of water is produced? (Mr H2O = 18.0)

If 2.00 g of hydrogen reacts with 16.0 g of oxygen to form water, which reactant is the limiting reagent? (Mr H2 = 2.0, O2 = 32.0)

A solution contains 0.100 mol of HCl in 250 cm3. What is the concentration in mol/dm3?

A student burns 0.050 mol of propane C3H8. How many moles of CO2 are produced? (Combustion: C3H8 + 5 O2 ? 3 CO2 + 4 H2O)

A reaction has a theoretical yield of 25.0 g of product. If the actual yield is 18.8 g, what is the percentage yield?

At RTP 1 mole of any gas occupies 24.0 dm3. If 48.0 dm3 of oxygen is collected, how many moles is that?

Which calculation gives the number of moles in 36.0 g of water (H2O)? (Ar H = 1, O = 16)

If 10.0 g of magnesium react with excess hydrochloric acid to form magnesium chloride and hydrogen, the mass of hydrogen produced (approximately) is closest to:

If 0.250 mol of NaCl is dissolved in enough water to make 0.500 dm3 of solution, what is the concentration in mol/dm3?