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Molar Mass
Mass
Moles
# of Entities
# of Atoms
100
What is the molar mass of Xe?
131.293 g/mol
100
Calculate the mass of 6.50 mols of KBr.
767g
100
Calculate the number of moles in 250 grams of CaCO3.
2.50 mol
100
Calculate the number of water molecules if there are 6 moles.
3.61E24 water molecules
100
Calculate the number of oxygen atoms. There are 2.02E23 molecules of CO2.
4.04E23 O atoms
200
What is the molar mass of Na2CO3 10H20?
402.93g/mol
200
What is the mass of 2.40E24 molecules of O2?
128g
200
How many moles are equivalent to 9.03E23 molecules of H2O?
1.50 mol H2O
200
Calculate the number of formaldehyde (CH20). There are 2.02E24 atoms of H.
1.01E24 formaldehyde molecules
200
How many oxygen atoms are there in 2.00 moles of SO2?
2.4E24 oxygen atoms
300
A sample of gas has a mass of 8.50g. What is the molar mass of a 0.531 sample of this gas?
16.0 g/mol
300
Calculate the mass of glucose sample (C6H12O6). There are 5.05 x10^24 O atoms in the sample.
252 g of Glucose
300
Calculate the number of moles of a sample of Acetic Acid (CH3COOH). There are 2.51E24 atoms of Hydrogen.
1.04 mol
300
What is the number of atoms contained in 12.01g of helium?
1.81E24 atoms of He
300
Calculate the number of C atoms in 25 g of benzene (C6H6).
1.2E24 C atoms