Balancing Equations
___ H2 + ___ O2 → ___ H2O
What is
2 H2 + O2 → 2 H2O ?
3 Mg + N2 → Mg3N2
How many grams of N2 were consumed, if 6.1 grams of Mg3N2 are produced?
What is 1.69 grams if N2?
6.1 grams * (1mol)/(100.95g) * (1mol)/(1 mol) * (28.02 g)/(1 mol) = 1.69g
Molar Mass of C2H7N
What is 45.10 grams?
2(12.01) + 7(1.01) + 14.01 = 45.10
Mass of 2.54 mol of Zn
What is 166 g of Zn?
2.54 mol * (65.38g)/(1mol) = 166.0654 g
Unit for Molar Mass
What is grams per mol (g/mol)?
__ CH4 + __ O2 → ___ CO2 + __ H2O
What is CH4 + 2 O2 → CO2 + 2 H2O
Ca(ClO3)2 → CaCl2 + 3 O2
If 43.85 grams of O2 are produced, how many grams of CaCl2 will also be produced?
What is 79.93 grams of CaCl2?
43.85g * (1 mol)/(32.0g) * (1 mol)/(3 mol) * (174.99g)/(1 mol) = 79.93g
Molar mass of NiCO3
What is 118.70 grams?
58.69+12.01 +3(16.00)= 118.70g
Moles of NH3 atoms in 99.4 g of NH3
What is 5.84 mol of NH3?
99.4 g * (1 mol)/(17.031g) = 5.836570
6.022 * 1023
What is Avogadro's Number?
__ CH3OH + __ O2 → __ CO2 + __ H2O
2 CH3OH + 3 O2 → 2 CO2 + 4 H2O
2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
How many grams of H2O are produced when 5.38g of O2 is reacted?
What is 2.33 g of H2O ?
5.38g * (1mol)/(32.00g)*(10mol)/(13mol)* (18.02g)/(1mol) = 2.33g
Molar Mass of Na2B4O7 * 10 H2O (Borax)
What is 381.42 g/mol?
2(22.99g) + 4(10.81g) +17(16.00)g + 20(1.01g) = 381.42
Mass of 6.74 moles of Hg atoms
What is 1350 grams of Hg?
6.74 mol * (200.59 grams) / (1 mol) = 1351.97 grams
Numbers in front of the chemical formulas
What are Coefficients?
___ CO + ___ H2 → ___ C8H18 + ___ H2O
What is
8 CO + 17 H2 → C8H18 + 8 H2O
2 KClO3 → 2 KCl + 3 O2
How many grams of O2 will be formed from 3.76 grams of KClO3?
What is 1.47g of O2 ?
3.76 g * (1 mol)/(122.55g)* (3mol)/(2mol)* (32g)/(1mol)= 1.47 g
Molar Mass of C18H36O2
What is 284.54 grams per mol (g/mol)?
18(12.01g) + 36(1.01g) +2(16.00g) = 284.54 g/mol
Mole of Sn atoms in 557.2 grams of Sn
What is 4.694 moles of Sn?
557.2 g * (1 mol)/(118.71 g) = 4.694 mol
Substances formed by a chemical reaction
What are Products?
___ Ca3(PO4)2 + ____ NaOH → ____ Na3PO4 + _____ Ca(OH)2
What is
Ca3(PO4)2 + 6 NaOH → 2 Na3PO4 + 3 Ca(OH)2 ?
NaI + Cl2 → NaCl + I2
What mass of sodium chloride is produced when chlorine gas reacts with 0.29 grams of sodium iodide?
What is 0.11 g of NaCl?
0.29 g * (1 mol)/(149.89g) * (2 mol)/(2 mol) * (58.44g)/(1 mol)= 0.11299g
The mass of 1 mole of Rh atoms
What is 102.91 g/mol?
Moles of Al atoms in 37.2 g of Al
What is 1.38 mol of Al?
37.2 g * (1mol)/(26.98g) = 1.378799 mol
Mass in grams of one mole of of a substance
What is Molar Mass?