Stoichiometry Question Preview (ID: 49848)


Mole Ratio, Limited Reactants And Percent Yield. TEACHERS: click here for quick copy question ID numbers.

How many moles of potassium chloride are produced when 0.0639 moles of potassium reacts with excess of chlorine gas? 2 K + Cl2 ® 2KCl
a) 0.0320 mol
b) 0.0639 mol
c) 0.128 mol
d) 0.256 mol

In the balanced equation: 2 H2 + O2 = 2 H2O
a) 4 moles of water are produced for every mole of hydrogen reacted
b) 2 moles of hydrogen react with 1 mole of oxygen
c) 2 moles of hydrogen reacts with 2 moles of oxygen
d) 4 moles of hydrogen reacts with 2 moles of oxygen

What is conserved in every chemical reaction?
a) mass and moles
b) mass and atoms
c) mass and molecules
d) mass and liters

The calculated amount of a product that should be produced in a chemical reaction is called the:
a) expected yield
b) true yield
c) actual yield
d) theoretical yield

A particlular reaction is expected to produce 2.6 g of sodium. In reality, the reaction only produced 1.9 g of sodium. The percent yield of the reaction is:
a) 73%
b) 27%
c) 137%
d) 42%

When two substances react to form products, what is the reactant that is used up first called?
a) polyatomic reactant
b) catalytic reactant
c) limiting reactant
d) excess reactant

The number of atoms of one mole of an element is equal to
a) Aufbau’s number
b) Avogadro’s number
c) one molecule
d) one gram

Where do you find the numbers used for mole ratios?
a) total mass of products
b) periodic table
c) balanced chemical equation
d) molar masses

Stoichiometry problems may involve all of the following except:
a) Predicting how fast a reaction will occur
b) Determining the relationship between reactants and products
c) Converting among moles, particles, mass and volume
d) Studying the mole relationship in a chemical reaction

How many grams of oxygen are in a sample of 0.0625 mol O2?
a) 2.00 g
b) 32.0 g
c) 1.00 g
d) 2.88 g

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