3. Chemical Reactions

In the reaction 2Al + 3Cl_2 → 2AlCl_3, if 4.0 moles of Al are mixed with 6.0 moles of Cl_2, how many moles of the excess reactant remain after the completion of the reaction?

2. Which of the following is the correct method to convert between moles of one substance and moles of another substance in a chemical reaction?

A chemical reaction has the following balanced equation: 2 H_2 + O_2 ightarrow 2 H_2O. If you start with 4 grams of H_2, how many grams of H_2O can be produced, assuming excess O_2?

How many grams of Ca(OH)_2 are required to prepare 100 mL of a 0.250 M solution?

If you have 9 moles of CaCl2 and an excess of Na3PO4, how many moles of Ca3(PO4)2 can be formed according to the balanced equation: 3 CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl?

In the preparation of alum, which method is commonly used to remove excess reactants from the alum product?

A solution contains 0.10 mol/L BaCl2. What is the minimum volume (in L) of 0.20 mol/L Na2SO4 solution that must be added to 100.0 mL of the BaCl2 solution to initiate the precipitation of BaSO4? Assume complete mixing and that BaSO4 begins to precipitate when the product of [Ba^{2+}] and [SO_4^{2-}] exceeds the K_{sp} of BaSO4 (K_{sp} = 1.1 imes 10^{-10}).

How many grams of hydrogen are present in 2 moles of H_2O?

How many grams of sodium bicarbonate (NaHCO_3) are required to produce 40 mL of CO_2 gas at standard temperature and pressure (STP)?

If 4.0 moles of NaOH react completely with excess CO2 according to the equation 2 NaOH + CO2 → Na2CO3 + H2O, how many moles of Na2CO3 can be produced?

In the reaction 2 H2S + O2 → 2 S + 2 H2O, which species has the greatest rate of appearance?

Given the reaction: C2H6O + 3 O2 → 2 CO2 + 3 H2O, how many molecules of C2H6O are required to react completely with 1.36 mol of O2?

In neutral sodium bromide (NaBr), what is the ratio of sodium ions to bromide ions present in the compound?

In the balanced chemical equation for the synthesis of ammonia, N_2 + 3H_2 → 2NH_3, what is the mole ratio of hydrogen (H_2) to ammonia (NH_3)?

In the reaction 4Al + 3O_2 → 2Al_2O_3, how many moles of O_2 are consumed when 11.0 mol of Al are reacted?