Mole Calculation
How many grams are in 1 mole of Hydrogen gas?
2.0 g
Hydrogen in H2O
What is the definition of an empirical formula?
The lowest whole # ratio of elements within a compound.
The empirical formula for a compound is CH2, its molar mass is 28g/mol. What is the molecular formula?
C2H4
Fe+ Cl2 −−→ FeCl3
How many grams are in 0.45 moles of Calcium?
18. grams Ca
What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?
C3H3O
A compound with an empirical formula of C4H4O and a molar mass of 136 grams per mole.
C8H8O2
FeBr3 + H2SO4 −−→ Fe2(SO4)3 + HBr
Sulfur in N2S2
What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?
Li2CO3
A compound with an empirical formula of C2H8N and a molar mass of 46 grams per mole.
C2H8N
C2H4 + O2 −−→ CO2 + H2O
magnesium Mg(NO3)2
The percentage composition of acetic acid is found to be 39.9% C, 6.7% H, and 53.4% O. Determine the empirical formula of acetic acid.
CH2O
A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole.
C2F2Br2O2
H2SiCl2 + H2O −−→ H8Si4O4 + HCl
10g of gold or 10g of silver?
Hydrogen in (NH4)3PO4
Congratulations!
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A component of protein called serine has an approximate molar mass of 100 g/mole. If the percent composition is as follows, what is the empirical and molecular formula of serine? C = 34.95 % H= 6.844 % O = 46.56 % N= 13.59 %
C3H7NO3
HSiCl3 + H2O −−→ H10Si10O15 + HCl