Module 8 test

One type of stomach antacid Al(OH)3, can be made in the following way: Al2(SO4)3+6NaOH—> 2Al(OH)3+3Na2SO4. How many moles of Al(OH)3 can be made with 2.3 moles of NaOH and excess Al2(SO4)3?

0.77 moles of Al(OH)3

Fill in the blank using the equation. 2HF+CaO2H2—> 2H2O+CaF2 two moles of HF react with ___________ mole(s) of CaO2H2 to make ____________ mole(s) of H2O and ____________ mole(s) CaF2

1,2,1

If the reaction in the previous problem was run with excess water, how many liters of HCl would be produced from 10.0 liters of ClO2?

1.67 liters of HCl

With the reaction and qualities given in the previous problem, how many moles of Fe would be formed?

2 moles of Fe

according to this equation, how many moles of Ag2S will be produced from 6.2 moles of Ag? H2S and O2 are in excess. 4Ag+2H2S+O2—>2Ag2S+2H2O

3.1 moles of Ag2S

A chemist preforms the following reaction: 6ClO2 (g)+3H2O (l)—> 5HClO3 (l)+HCl (g) If the chemist wants to make 50.0g of HClO3, what is the minimum number of grams of ClO2 that she must use?

47.9g of ClO2

AgBr, a chemical used in photography, can be made with this reaction: 2AgNO3+CaBr2—>2AgBr+CaN2O6 AgNo3 is very expensive, so in making AgBr you want to be sure this reactant is all used up. If a chemist starts with 15.0g of AgNO3, how many grams of CaBr2 must be added to use up all of the AgNO3?

8.84 grams of CaBr2

Relating the qualities of different substances in a chemical equation is called ______________? a. molar mass b. balancing equation c. stoichometry d. limiting reactions

C. Stoichometry

A compound has an empirical formula of CH2 and a molecular mass of 70.1 amu. What is its molecular formula?

C5H10

Consider the following reaction: Fe2O3 (s)+3CO (g)—> 2Fe (s)+3CO2 If two moles of Fe2O3 are reacted with 3 moles of CO what is the limiting reactant?

CO

Which formula indicates a simple, whole number ratio for atoms in a molecule?

Empirical formula

What is needed to convert an empirical formula into a molecular formula?

Mass of the molecule involved

An unknown compound is decomposed into 6.9g of Na, 3.1g of P and 6.4g of O. What is its empirical formula?

Na3PO4

The chemical that is responsible for stopping reactions is called _____________?

The limiting reactant

What is a stoichiometric coefficient?

The number appearing before the symbol for each compound in the equation for a chemical equation

State Gay-Lussac's law and its limitations

The stoichiometric coefficients in a chemical equation relate the volumes of gasses in the equation as well as the number of moles of substances in the equation. It can only be used if the substances being compared are gasses.

true or false: the limiting reactant is responsible for determining how much product is produced.

True

Which of the following is NOT an empirical formula? a. CH3O b. H2O c. NaCl d. C6HaO3 e. None of the above.

d. C6HaO3

What is wrong with the filling statement? In the reaction N2+3H2->2NH3, I gram of N2 reacts with 3 grams of H2 to make 2 grams I'd NH3

the coefficients mean the number of moles, not grams