3. Chemical Reactions

A mixture of CaCO₃ and CaO has a mass of 2.5000 g. After heating, the mass of the sample is reduced to 2.016 g due to the decomposition of CaCO₃ into CaO and CO₂. What is the mass percent of CaCO₃ in the original mixture?

When 2.50 mol of Al and 3.00 mol of Cl2 combine in the reaction 2Al(s) + 3Cl2(g) → 2AlCl3(s), how many moles of the excess reactant remain at the end of the reaction?

Ammonia gas decomposes according to the equation: 2NH3(g) → N2(g) + 3H2(g). If 15.0 L of nitrogen is formed at STP, how many liters of hydrogen will be produced (also measured at STP)?

Zinc metal reacts with aqueous silver nitrate to form solid silver and aqueous zinc nitrate. If 2.00 g of zinc react with 2.50 g of silver nitrate, how many grams of silver will form?

What is the maximum amount of water (in grams) that can be produced when 964.91 g of C3H8 reacts with 511.39 g of oxygen according to the balanced equation: C3H8 + 5 O2 -> 3 CO2 + 4 H2O?

According to the following reaction, 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(l), how many grams of sulfur are formed when 37.4 g of water are produced?

Stoichiometric amounts of nitrogen gas and hydrogen gas react in a calorimeter to produce 5 g of ammonia gas. The calorimeter temperature rises 0.42 °C. The calorimeter and water have a combined heat capacity of 32.16 kJ/°C. Calculate the heat of formation of ammonia (in kJ/mol).

How many grams of Li3N can be formed from 1.75 moles of Li, assuming an excess of nitrogen? The balanced equation is: 6 Li(s) + N2(g) → 2 Li3N(s).

How many grams of CaCl2 are formed when 15.00 mL of 0.00237 M Ca(OH)2 reacts with excess Cl2 gas according to the reaction: 2 Ca(OH)2(aq) + 2 Cl2(g) → Ca(OCl)2(aq) + CaCl2(s) + 2 H2O(l)?

What mass, in grams, of potassium chlorate (KClO3) is needed to contain 0.8542 mol of oxygen atoms?

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide. The balanced chemical equation is: 4HCl(aq) + MnO2(s) → MnCl2(aq) + 2H2O(l) + Cl2(g). A sample of 33.7 g of MnO2 is added to a solution containing 48.3 g of HCl. What is the limiting reactant?