Molar Mass Elements
Round each answer to a whole number:
What is the molar mass of Al?
Al = 26.982 --> 27 g/mol
Round each answer to a whole number:
What is the molar mass of CO2?
C = 12g/mol
O = 16g/mol * 2
CO2 = 44 g/mol
What is the mass of 2.0 moles of O2?
frac{2.0mol}{1}*frac{32 g}{mol}=64g O_2
How many moles are in
5.32*10^24 "particles?"
frac{5.32*10^24 "particles"}{1}*frac{1 mol}{6.02*10^23 "particles"}=8.84mol
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{14gN}{1mol}=140gN
Round each answer to a whole number:
What is the molar mass of O?
O= 15.999 --> 16 g/mol
Round each answer to a whole number:
What is the molar mass of LiF?
Li = 7 g/mol
F = 19 g/mol
LiF = 26 g/mol
How many moles are in 60g of CaCl2?
frac{60g}{1}*frac{1 mol}{110g}=0.545 molCaCl_2
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}{32gS}=0.5molS
frac{0.5molS}{1}*frac{6.02*10^23 "atoms"}{1mol}=3.01*10^23 "atoms of sulfur"
Round each answer to a whole number:
What is the molar mass of chlorine?
Cl = 35.45 --> 35 g/mol
Round each answer to a whole number:
What is the molar mass of Al2O3?
Al = 27g/mol *2 = 54g/mol
O = 16g/mol *3 = 48g/mol
Al2O3 = 102g/mol
What is the mass of 0.3 mol of potassium chloride?
potassium chloride = KCl
frac{0.3mol}{1}*frac{74 gKCl}{mol}=22.2g KCl
What is greater: A) 0.005 moles or B)
2.5*10^21 "particles?"
0.005 mol =
frac{0.005mol}{1}*frac{6.02*10^23 "particles"}{mol}=3.01*10^21"particles" which is greater than 2.5*10^21
Answer: A
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.