Moles & Molar Mass
What is a mole?
What is the unit that measures the amount (number of particles) of a substance?
What a subscript indicates
The number of atoms of that element or polyatomic group
Formula used to calculate moles from grams
Given the balanced equation:
3Cu + 8HNO3 🡪 3Cu(NO3)2 + 2NO + 4H2O
What is the mole ratio between Cu and NO?
3:2
Describe an empirical formula
The most simplified ratio of a molecular formula, the coefficients do not have a common divisor.
Molar Mass of Fe
What is 55.8 g/mole?
Total number of moles of Oxygen in Ca3(PO4)3
12
moles in 39.0 g of LiF
What is 1.51 moles
Moles of O2 consumed when 0.6 moles of H2 burns, given:
2H2 + O2 > H2O
0.3 moles
empirical formula for C6H12O6
CH2O
Molar Mass of H2O
What is 18.0 g/mole
What a coefficient indicates
total number of molecules
Mass of 0.5 moles of CuSO4
79.81 g
Moles of N2 needed to produce 10 moles of NH3, given:
N2 +3H2 > 2NH3
5
How is a hydrate's molecular formula written?
Compound formula * nH2O
the conversion factor for moles to particles
Avogadro's number/
6.02 x 1023
Total number of calcium in 3Ca3(PO4)2
9
grams of 4.5 moles of KOH
(round to whole number)
252 g
Moles of H2O formed from 12 moles of C3H8 and 30 moles O2 given:
C3H8 + 5O2 > 3CO2 + 4 H2O
24
Percent composition of Ca in CaCl2
36.1%
Define Gram Formula Mass and state its unit
What is the mass of the formula
g/mole
Total number of atoms in for all elements in NH4NO3
9
Number of moles of Carbon in 2C6H12O6
12
Given the unbalanced equation: ___Na + __ H2O ____ H2 + ____NaOH
When this equation is correctly balanced using the smallest whole-number coefficients, the coefficient for H2O is:
2
2 Na + 2 H2O > H2 + 2 NaOH
% composition of water in the hydrate BaCl2 * 2H2O
14.74%