Chemical equations and stoichiometry

Question 1 of 10

In N₂ + 3H₂ → 2NH₃, 1 mol of nitrogen reacts completely to give ___ mol of ammonia.

Question 2 of 10

The reactant that is completely used up and limits the amount of product is the

Question 3 of 10

Balance: __Mg + __O₂ → __MgO

Question 4 of 10

A balanced chemical equation obeys the law of

Question 5 of 10

Percentage yield can be greater than 100% for a pure, dry product.

Question 6 of 10

You may change subscripts in formulae to balance an equation.

Question 7 of 10

Balance: __Na + __Cl₂ → __NaCl

Question 8 of 10

The state symbol (aq) means

Question 9 of 10

In N₂ + 3H₂ → 2NH₃, 2 mol of nitrogen reacts completely to give ___ mol of ammonia.

Question 10 of 10

Sodium hydroxide reacts with hydrochloric acid: NaOH + HCl → NaCl + H₂O. A student neutralised 4 g of sodium hydroxide with excess acid and obtained 5.27 g of dry sodium chloride. (Na = 23, O = 16, H = 1, Cl = 35.5) Calculate (a) the moles of NaOH used, (b) the theoretical mass of NaCl, (c) the percentage yield. (d) Give one reason why the yield is less than 100%.