Writing and Balancing Chemical Equations — Unit test Answers

Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

If a compound has a molar mass of 180 g/mol and its empirical formula is CH2O, what is its molecular formula?

The following balanced equation shows the formation of sulfur dioxide.S + O2 SO2How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq) Which coefficient should be placed in front of NaCl to balance this equation?

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

What is the empirical formula for propene (C3H6)?

Which statement best explains the purpose of using a mole in the measurement of matter?

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium?

Consider the equation for the formation of water.2H2 + O2 2H2OWhat is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?

In a chemical reaction, substance R reacts with compound XY to produce 47.0 g of compound RX. If the theoretical yield of RX is 56.0 g, what is its percent yield?Use .

What is the percent by mass of water in Na2SO4 • 10H2O?Use .

Which statement is true about an empirical formula?

Consider the equation below.Zn + H2SO4 ZnSO4 + H2The mole ratio of zinc to zinc sulfate is

What is the relationship between a mole and Avogadro’s number?