Molar Mass
What is the Molar Mass of Mg(C2H3O2)2?
142.41 g/mol
What is the percent composition of oxygen in KMnO4?
40.50% Oxygen
How many moves are in 5.00 x 1026 molecules of fluorine F2?
831 mole F2
A sample contains 52.94% Al and 47.06% O. What is the empirical formula of the substance?
Al2O3
How many grams of H2SO4 are in 1.50 Liters of a 1.55 M sulfuric acid solution?
228 g H2SO4
What is the Molar Mass of (NH4)2Cr2O7?
252.08 g/mol
An iron ore is known to contain only iron and oxygen. A 45.3 g sample of the ore is analyzed and found to contain 31.7 g of iron and the remainder is oxygen.
Find the percent composition of Iron.
Fe 70%
How many molecules are in 16.2 moles of CO?
9.75 x 1024 molecules of CO
A compound is composed of 4.80 grams of carbon and 0.40 grams of hydrogen. The molecular mass of the compound is 78.0 g/mole. What is the molecular formula of the compound?
C6H6
How many liters of water are needed to prepare a 1.67 M solution of (NH4)3PO4 if you need to dissolve 235 grams of (NH4)3PO4.
0.944 L H2O
What is the Molar mass of Ba3(PO4)2?
601.93 g/mol
An iron ore is known to contain only iron and oxygen. A 45.3 g sample of the ore is analyzed and found to contain 31.7 g of iron and the remainder is oxygen.
Find the percent composition of Oxygen.
30.0%
How many molecules are in 67.0 grams of KCl?
5.41 x 1023 molecules of KCl
When 5.00 g of FeCl3-H2O are heated, 2.00 g of H2O are driven off. Find the chemical formula of the hydrate.
FeCl3-6H2O
If 8.40 grams of NaOH are dissolved in 200 mL of water what is the concentration of the solution?
1.05 M NaOH
What is the Molar mass of C8H10N4O2?
194.19 g/mol
What is the percent composition of hydrogen in CaC4H6O4?
3.83% Hydrogen
How many hydrogen atoms are in 78.4 grams of HCl?
1.29 x 1024 atoms of H
When 8.00 g of Pb(C2H3O2)2-H2O are heated, 1.14g of H2O are driven off. Find the chemical formula.
Pb(C2H3O2)2-3H2O
What is the molarity of a solution that 49.0 grams of CaBr2 in 2.0 Liters of solution?
0.12 M
What is the Molar mass of Fe2(SO4)3?
399.88 g/mol
A 138 g sample of a compound is analyzed and found to contain 25.8 g of lithium, 22.5 g of carbon, and the remainder to be oxygen. Calculate the percent composition of Lithium, Carbon, and Oxygen.
Li: 18.7%
C: 16.3 %
O: 65.0%
How many chloride atoms are in 35.68 grams of Cl2?
6.059 x 1023 atom Cl
A hydrate is determined to be 45.43% water and 54.57 CoCl2. Find the chemical formula for this hydrate.
CoCl2-6H2O
How many grams of Na2SO4 sodium sulfate are needed to prepare 1500 mL of a 0.25 M solution of sodium sulfate?
53 g Na2SO4