Moles and Such - Practice Test

Sample mole problems:

 1.  Find the number of oxygen atoms in 2.45 moles of ammonium silicate

2.  Find the mass of aluminum in 3.40 E 14 ion pairs of aluminum bromate

3.  Find the number of moles of calcium arsenate   if given 4.00 E 3 grams of the compound

4.  Using copper (II) pyrophosphate, find ______ g copper, ________atoms phosphorus, _______moles of oxygen

 

Sample molarity, % composition, empirical and molecular formlas:

1.  Find % composition for oxygen in potassium chlorite

2.  Find % composition for each element in cobalt (III) sulfate

3.  Find molarity of a 488 mL solution of gold (III)  bromate

4.  Find molarity of 200 mL solution of strontium citrate

5.  Find empirical formula if given:   N = 11.2 %    H = 3.20 %    Cr = 41.2 %    O = 44.4 %

6.  Find empirical formula if given:  Fe = 53.8 %    S = 15.4 %     O = 30.8 %

7.  Find molecular formula if given a molecular weight of 104 and: Si = 27.0 g    F = 73.0 g      (100 gram sample)

8.  Find molecular formula if given a molecular weight of 124.4 and: Si = 90.4 g    H = 9.60 g  (100 gram sample)