Naming
Sodium Chloride
NaCl
How many grams in 1.40 mol HBr
113g
When a 13.60 g sample of a compound containing only magnesium and oxygen is decomposed, 5.40 g of oxygen is obtained. What is the percent composition of oxygen.
39.7%
Quantitative analysis shows that a compound contains 32.4% Na, 22.6% S, and 45.0% O. Find the empirical formula of this compound.
Na2SO4
Determine the molecular formula of the compound with the empirical formula of CH and a molecular mass of 78.110 g/mol.
C6H6
N2O2
DiNitrogen Dioxide
How many grams in 0.38 Ba(NO3)2
99g
A compound is formed when 9.03 g Mg combine completely with 3.48 g N. What is the percent composition of nitrogen?
27.8%
Find the empirical formula from the following information: 40.0% C , 6.70% H , 53.30% O
CH2O
Determine the molecular formula of the compound with the empirical formula of CH and a molecular mass of 78.110 g/mol.
C6H6
Fe2O3
Iron (III) oxide
How many mols in 3.85g Sb(NO3)3
0.0125mol
Calculate the percent composition of Iron in Iron (I) Sulfide.
77.67% of Iron
Analysis of a 10.150 g sample of a compound know to contain only phosphorus and oxygen indicates a phosphorus content of 4.433g. What is the empirical formula of this compound?
P2O5
A sample of a compound with a molecular mass of 34.00 g/mole is found to consist of 0.44 g H and 6.92 g O. Find its molecular formula.
H2O2
Calcium Phosphate
Ca3(PO4)2
How many molecules are there in 19.5g N2O2
1.96 x 1023
Zinc chloride, ZnCl2, is 52.02% chlorine by mass. What mass of chlorine is contained in 80.3 g of ZnCl2?
41.8g
What is the empirical formula of 60.98% and As 39.02% S
As2S3
A sample of a compound with a molecular mass of 32.06 g/mol is found to consist of 0.51g N and 0.053g of H. Find its molecular formula.
N2H3
Fe (III) Nitrite
Fe(NO2)3
How many molecules are in 25.0 g H2SO4
1.54 x 1023
Find the mass percentage of water in ZnSO4x 7H2O?
43.86%
What is empirical formula if compound consists of 21.2%N, 6.1 %H, 24.2%S and 48.5%0?
N2H8SO4
Sample (3.585g) contains 1.388g of C, 0.345g of H, 1.850g O and its molar mass is 62g. What is molecular formula of this substance?
C2H6O2