Review - % Composition, Empirical & Molecular Formulas, and Mole Calculations

DETERMINE THE % COMPOSITION OF...

1.    nitrogen in dinitrogen pentoxide

2.    phosphorus in iron (II) phosphate

3.    copper in copper (I) sulfide

DETERMINE THE EMPIRICAL FORMULA IF...

4.    54.6 % potassium, 8.70 % carbon, 34.9 % oxygen

5.    15.8 % carbon, 84.2 % sulfur

6.    29.40 % calcium, 23.56 % sulfur, 47.04 % oxygen

DETERMINE THE MOLECULAR FORMULA IF...

7.    30.43 % nitrogen, 68.57 % oxygen
        molar mass = 93 g/mole

8.    47.4 % sulfur, 52.6 % chlorine
        molar mass = 135 g/mole

9.    43.6 % phosphorus, 56.4 % oxygen
        molar mass = 284 g/mole

CALCULATE...

10.    How many moles of silver could be obtained from 5.6 moles of silver sulfide?

11.    How much (moles & grams) of iron could be obtained from 3,000. grams of iron (II)
        oxide?

12.    120. grams of sulfur trioxide to moles

13.    0.020 moles potassium dichromate to grams


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