Molar Mass Percent Composition
Name: __________________________________Date: _______________ P____R____S____
Honors Chemistry
Percent Composition Worksheet
Calculate the percentage composition of each of the following compounds. Show your work and always include units (Show the answer from calculator first, then round the answers to 2 decimal places).
1. Ca3P2 (66.0% Ca, 34.0% P) % Ca = 120.24 x 100% % P = 61.94_ x 100%
182.15 182.15
MM of Ca3P2:
= 66.00065869 % = 33.9993413%
3 (Ca) = 3 (40.08) = 120.24
2 (P) = 2 (30.97) = 61.94_ = 66.00 % Ca = 34.00% P
182.15 g/mol
Ca3P2 Checking: 66.00 % + 34.00% = 100.00%
2. Ca(OH)2 (54.1% Ca, 43.2% O, 2.7% H)
3. Na2SO4 (32.4% Na, 22.6% S, 45.0% O)
4. CaSO4 (29.4% Ca, 23.6% S, 47.0% O)
5. (NH4) 2SO4 (21.2% N, 6.1% H, 24.3% S, 48.4% O)
6. Zn3(PO4)2 (50.8% Zn, 16.1% P, 33.1 % O)
7. Mg(NO3)2 (16 % Mg, 18 % N, 64 % O)
8. CrF3 (48% Cr, 52% F) 9. Na3PO4 (42 % Na, 19% P, 39% O)
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(From MM)
Never Use 100% - ____%
1) Round to 2 decimal places
2) Checking: Add up all % (99.99% -100.01 %)
% composition MM of Ele x 100%
Of each element = MM of Cpd
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