3. Chemical Reactions

In the reaction 2 H_2 + O_2 → 2 H_2O, what is the number of moles of hydrogen gas (H_2) required to produce 0.253 mol of water (H_2O)?

In the reaction N_2 + 3H_2 ightarrow 2NH_3, how many grams of ammonia (NH_3) are produced when 1.0 mole of nitrogen gas (N_2) reacts completely with excess hydrogen gas?

In the reaction N_2 + 3H_2 → 2NH_3, how many moles of hydrogen gas (H_2) are required to completely react with 0.850 moles of nitrogen gas (N_2)?

What mass of KBr is required to prepare 35.0 mL of a 1.80 M KBr solution?

How many grams of CuSO_4·5H_2O are required to prepare 25 mL of a 0.020 M stock solution?

If 60 grams of ethane (C_2H_6, molar mass 30 grams/mol) react completely with excess oxygen according to the equation 2 C_2H_6 + 7 O_2 → 4 CO_2 + 6 H_2O, how many moles of CO_2 are produced?

In the reaction 4Al + 3O_2 → 2Al_2O_3, how many moles of O_2 are consumed when 8 moles of Al are reacted?

In the reaction 2H_2 + O_2 ightarrow 2H_2O, what is the total number of molecules reacting when 2 molecules of H_2 react with 1 molecule of O_2?

Which of the following could NOT be used to determine reaction stoichiometry?

An iron bar weighing 56.0 g reacts completely with excess hydrochloric acid according to the equation: Fe + 2HCl → FeCl2 + H2. What mass of H2 is produced?

How many grams of K2Cr2O7 are required to prepare 250 mL of a 0.10 M solution?

In the balanced chemical equation for the reaction between ethylenediaminetetraacetic acid (EDTA) and calcium ion (Ca^{2+}), what is the mole ratio of EDTA to Ca^{2+}?

Given the reaction 2Al + 3CuCl2 → 2AlCl3 + 3Cu, if 10.5 g of CuCl2 react with 12.4 g of Al, what is the limiting reactant?

When 24.3 g of magnesium reacts completely with excess hydrochloric acid according to the equation Mg + 2HCl → MgCl_2 + H_2, how many grams of magnesium chloride (MgCl_2) are produced?

Which of the following is a valid mole ratio from the balanced equation 2Fe2O3 + 3C → 4Fe + 3CO2?