Mighty Mole
More Moles Madness
Conservation of Energy
Percent Mass Calculations
Empirical/Molecular Madness
100
How many grams are in 1 mole of gold?
197 g Au
100
How many grams are in 1 mole of CaOH?
57 g CaOH
100
Why does this equation follow the conservation of energy?
AgNO3 + KCl --> AgCl + KNO3
The same type and amount of each atom on both sides of the equation. Energy is not created nor destroyed, the atoms rearrange to form different substances.
100
Put these substances in order of increasing percent mass of oxygen in the compound.
HClO2
HClO
HClO4
HClO3HClO, HClO2, HClO3, HClO4
100
The molecular formula for a substance is C4H6. What is the empirical formula?
C2H3
200
How many particles are in 1 mole?
6.02 x 1023 particles
200
What is the total mass in grams of 0.5 moles of SO2?
32 g SO2
200
Balance the following equation:
__ Cu + __ AgNO3 --> __ Cu(NO3)2 + __ Ag
Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
200
What is the percent of hydrogen by mass in water?
11%
200
What is a possible molecular formula for a substance with an empirical formula of N2O5 ?
x2: N4O10
x3: N6O15
x4: N8O20
300
How many moles are in 128 g of sulfur?
4 mole S
300
What is the total number of moles of O2 required to produce 6 moles of CO2?
C3H8 + 5O2 --> 3CO2 + 4H2O
10 mol O2
300
What type of reaction is the following?
Na3(PO4) + 3KOH --> 3NaOH +K3(PO4)
Double replacement reaction
300
A student heats a hydrate until the mass remains constant. The student records the following data:
Mass of the hydrate before heating = 4.65 grams Mass of the hydrate after heating = 3.09 grams
Determine the percent composition of water in the hydrate.
34.2 %
300
Determine the empirical formula for this substance.
C4H10O
400
How many moles of oxygen are needed for the complete combustion of 5.5 moles of methane?
CH4 + 2O2 --> CO2 + 2H2O
11 moles of methane
400
How many grams are in 2 moles of chlorine gas?
(70 g)/(1 mol Cl2) x 2 mol Cl2 = 140 g Cl2
400
Balance the following equation:
__C2H6 + ___O2 --> __ H2O + __ CO2
2C2H6 + 7O2 --> 6H2O + 4CO2
400
Determine the percent of water in this hydrate:
Na2S ᐧ 9H2O
67.5%
400
A compound has an empirical formula of CH2O and a gram-formula mass of 60. grams per mole. What is the molecular formula of this compound?
C2H4O2
500
How many grams of hydrogen is needed to form 4 moles of hydrogen fluoride?
H2 + F2 --> 2HF
4 g H2
500
How many molecules of water is produced when 1 mole of oxygen is used in combustion?
CH4 + 2O2 --> CO2 + 2H2O
6.022 x 1023 molecules of H2O
500
Balance the following equation and determine the type of reaction.
__ C4H10 + __ O2 → __ CO2 + __ H2O
2C4H10 + 13O2 → 8CO2 + 10H2O
500
Determine the percentage of hydrogen in the following compound:
CH3COOH
6.67% or 7%
500
What is the empirical formula of a compound that contains 28% iron, 24% sulfur, and 48% oxygen by mass?
Fe2(SO4)3