Molar Mass Compounds
What is the molar mass of CO2?
C = 12.01g/mol
O = 16g/mol * 2
CO2 = 44.01 g/mol
How moles are in 13.6g of nitrogen gas (N2)
frac{13.6g}{1}*frac{1 mol}{28.02g}=0.485 molN_2
What is the mass of 2.0 moles of O2?
frac{2.0mol}{1}*frac{32 g}{mol}=64g O_2
How many particles are in 1 mole of any given substance?
6.02 * 1023 particles
What is the mass of 6.02*10^24 "particles" of N?
frac{6.02*10^24 "pts."}{1}*frac{1mol}{6.02*10^23 "pts."}=10molN
frac{10molN}{1}*frac{14.01gN}{1mol}=140.1gN
What is the molar mass of LiF?
Li = 6.94 g/mol
F = 19 g/mol
LiF = 25.94 g/mol
How many moles are in 60g of CaCl2?
frac{60g}{1}*frac{1 mol}{110.98g}=0.541 molCaCl_2
What is the mass of 0.3 mol of potassium chloride, KCl?
frac{0.3mol}{1}*frac{74.55 gKCl}{mol}=22.4 g KCl
How many particles are in 2.0 moles of any substance?
frac{2.0mol}{1}*frac{6.02*10^23 "particles"}{mol}=1.20*10^24"particles"
How many atoms are in 16 grams of S?
frac{16gS}{1}*frac{1mol}{32.06gS}=0.499molS
frac{0.499molS}{1}*frac{6.02*10^23 "atoms"}{1mol}=3.00*10^23 "atoms of sulfur"
What is the molar mass of Al2O3?
Al = 26.98 g/mol *2 = 53.96g/mol
O = 16g/mol *3 = 48g/mol
Al2O3 = 101.96 g/mol
How many moles are in 200g of P2O5?
frac{200g}{1}*frac{1 mol}{141.94g}=1.41 mol P_2O_5
A student needs 2.5 moles of Mg(OH)2. How many grams do they need?
frac{2.5mol}{1}*frac{58.31 gMg(OH)_2}{mol}=145.78 g Mg(OH)_2
How many particles are in 0.0045 moles?
frac{0.0045mol}{1}*frac{6.02*10^23pts.}{1 mol}=2.71*10^21 pts.
What is greater: a) 50g of H2O or b) 1.70*10^24 "particles of" H_2O ?
frac{50gH_2O}{1}*frac{1mol}{18gH_2O}=2.78 mol
frac{2.78mol}{1}*frac{6.02*10^23pts.}{1mol}=1.67*10^24pts.
This is means that B is greater.