Molar Mass
What is the molar mass of Li?
6.94 grams/mole
How many grams are in 2.5 moles of H2O?
45.05 g
How many grams in 10.5 x 1023 atoms Mg?
42.38 g Mg
What is the percent composition of Na in NaCl?
39.3%
What is the empirical formula of C4H10?
C2H5
What is the molar mass of CO2?
44.01 grams/mole
How many moles in 3.011 x 1023 atoms Mg?
0.5000 mol Mg
How many atoms in 0.02550 g Pt?
7.872 x 1019 atoms Pt
What is the percent composition of O in CO3?
79.9%
A compound contains 1.52g of nitrogen and 3.47g of oxygen. What is its empirical formula?
NO2
What is the molar mass of Na2SO4
141.8 grams/mole
How many atoms in 6.755 mol Pb?
4.068 x 1024 atoms Pb
How many grams in 4.50 x 1012 atoms Cl?
2.65 x 10-10 g Cl
What is the percent composition of C in C6H12O6?
40%
A compound contains 18.8% sodium, 29.0% chlorine, and 52.2% oxygen. Determine the empirical formula.
NaClO4
What is the molar mass of Al(NO3)3?
213 grams/mole
How many atoms in 0.250 mol S?
1.51 x 1023 atoms S
How many grams in 8.42 x 1021 atoms NaBr?
1.44 g NaBr
What is the percent composition of O in Mg(NO3)2?
64.6%
Ascorbic acid is another name for vitamin C. It is composed of 40.92% C, 4.58% H, and 54.5% O. Determine the empirical formula of ascorbic acid.
C3H4O
What is the molar mass of CuCl2 4H2O?
206.48 grams/mole
How many moles in 0.00750 g Ag? (in scientific notation)
6.95 x 10-5 mol Ag
How many grams are in 1.45x1022 molecules of O2?
0.77 g O2
What is the percent composition of H2O in MgCl2 7H2O?
57%
L-Dopa, a drug used for the treatment of Parkinson's disease is 54.82% C, 5.62% H, 7.10% N and 32.46% O. What is the empirical formula of L-Dopa?
C9H11NO4