Formula Mass
What is the formula mass of silver sulfate
312 grams
How many carbon dioxide molecules are in 4.42 moles of the gas?
2.66x1024
How many moles are there in 125g of sulfuric acid (H2SO4)?
1.28 moles
What is the empirical formula of a compound that contains 7.83g of carbon, 2.0g of hydrogen, and 5.21g of oxygen?
C2H6O
What is the percent by mass of nitrogen in N2O?
64%
What is the formula mass of NH4C2H3O2?
77 grams
How many molecules are in 1.5 moles of water?
9.03 x 1023 molecules
How many grams are there in 1.5 x 1023 molecules of CO2?
11 grams
The empirical formula is CH. Its molar mass is 26. What is its molecular formula?
C2H2
What is the percent by mass of oxygen in CH3OH?
50.0 %
What is the molecular mass of (NH4)2SO4
132 grams
What is the number of atoms in 46 grams of sodium?
1.204 x 1024 atoms
How many moles are in 25 g of NaCl?
0.427 moles
The empirical formula of a substance is CH2O. The molar mass is 180. What is the molecular formula?
C6H12O6
What percent mass is nitrogen in Mg(CN)2?
36.8%
Calculate the gram formula mass of CaSO4 + 2H2O
172 grams
9.25x 1022 water molecules are produced from a reaction. How many moles is this?
0.154 mole
A box of baking soda (NaHCO3) contains 250 grams. How many moles of baking soda are in the box?
3 moles
What is the empirical formula of a molecule contains 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?
C3H3O
What is the percent by mass of water in the hydrate Na2CO3 . 10H2O?
62.9%
Calculate the gram formula mass of ammonium carbonate
(NH4)2CO3
96
The number of molecules contained in 0.2 mole of N2 at STP is
1.204 x 1023 molecules
A container of sodium phosphate contains 500g of powder. How many moles are in the container?
Na3PO4
3.05 moles
A 60g sample of tetraethyl lead is found to contain 38.43g lead, 17.83g carbon, and 3.74 g hydrogen. Find its empirical formula.
PbC8H21
A 9.3g sample of a hydrated salt is heated until it has a constant mass of 7.14g. What is the percent by mass of the water contained in the original sample?
23.2%