Molar Mass and Mole Concept
What is the molar mass of O2?
32.00 g/mol
Determine the empirical formula of a compound with 15.8% carbon and 84.2% sulfur.
CS2
Determine the type of reaction the following equation is: BaCl2 + Na2SO4 → BaSO4 + 2 NaCl
Double replacement
How many moles of Fe2O3 can form from 3.0 moles of O2? (Fe(s) + O2(g) → Fe2O3(s))
2.0 moles
How many atoms are in a 5.67 sample of gold (Au)?
1.73 x 1022
Find the empirical formula of a compound that contains 5.31 g of Cl and 8.40g of O.
Cl2O7
Correctly balance the following equation: _N2 (g) + _H2 (g) → _NH3 (g)
1, 3, 2
How many grams of C2H2 are burned if the reaction produces 7.2 moles of CO2? (2 C2H2 + 5 O2 → 4 CO2 + 2 H2O)
94 g
132.14 g/mol
How many moles of O are in in 7.780 g of Ba(ClO3)2?
0.1534 mol
Determine the type of reaction the following equations is: CH4 + 2 O2 → CO2 + 2 H2O + energy
Combustion
Farmers often use ammonium phosphate fertilizers, which are produced by reacting with ammonia with phosphoric acid:
3NH3 + H3PO4 --> (NH4)3PO4
A fertilizer plant mixes 112 grams of ammonia with 196 grams of phosphoric acid to produce ammonium phosphate.
What is the limiting reactant? How many grams of ammonium phosphate can be formed?
H3PO4, 298 g
How many grams are in 4.560 moles of sulfur?
146.2 g
A spacecraft returns from a mission with 125 grams of pure titanium. Calculate the number of titanium atoms they have.
1.57 x 1024
Write the balanced chemical equation when the following react: lead (II) nitrate and potassium iodide
Pb(NO3)2(aq)+2 KI(aq)→PbI2(s)+2 KNO3(aq)
In pottery, a common glaze-forming reaction occurs when sodium carbonate reacts with silica at high temperatures to form sodium disilicate and carbon dioxide. This glassy sodium silicate coats the ceramic surface.
Na2CO3 + 2 SiO2 → Na2Si2O5 + CO2
A ceramic artist combines 25.0 g of sodium carbonate with 35.0 g of silica in a kiln.
How many grams of the excess reactant remain after the reaction?
6.67 g of SiO2 remain
How many grams are in 5.67 x 1024 atoms of calcium phosphate?
2920 g
How many moles of N2O3 contain 2.55 x 1024 oxygen atoms?
1.41 mol N2O3
Balance the following equation: _HClO4 + _P4O10 → _H3PO4 + _Cl2O7
12, 1, 4, 6
In the blast furnace, iron (III) oxide reacts with carbon monoxide to produce iron metal and carbon dioxide:
Fe2O3 + 3 CO → 2 Fe + 3 CO2
A metallurgist reacts 25 moles of CO with excess Fe2O3. After the reaction, the metallurgist obtains 15 moles of Fe.
What is the percent yield of iron produced?
88% (Theoretical yield = 17 mol Fe)