Percentage Composition
A compound is found to contain 36.5% Na, 25.4 S, and 38.1% O. Find its empirical formula
Na2SO3
Find the empirical formula for 66.4% Cu, 33.6% S
CuS
___ H3PO4 + ___ KOH --> ___ K3PO4 + ___ H2O
1 H3PO4 + 3 KOH --> 1 K3PO4 + 3 H2O
How many moles are in 1.20x1025 atoms of phosphorous
58.25
How many moles of magnesium is 3.01 X 1022 atoms of magnesium
.05 moles
Find the empirical formula of a compound that is 53.7% iron and 46.3% sulfur.
Fe2S3
Find the empirical formula for 62.6% Ca, 37.4% C
CaC2
___ Rb + ___ S8 ---> ___ Rb2S
16 Rb +1 S8 ---> 8 Rb2S
How many atoms are in .75 moles of zinc
4.151e23
How many molecules are there in 4.00 moles of C6H12O6
2.41 X 1024
Analysis of a sample of a compound indicates that is has 1.04 g K, 0.70 g Cr, and 0.86 g O. What is its empirical formula?
K2CrO4
Find the empirical formula for 36.8% N, 63.2% O
N2O3
___ Ca3(PO4)2 + ___ SiO2 + ___ C ---> ___ CaSiO3 + ___ CO + ___ P
1 Ca3(PO4)2 + 3 SiO2 + 5 C ---> 3 CaSiO3 + 5 CO + 2 P
How many molecules are in .4 moles of N2O5
2.408e23
How many moles are in 28grams of CO2
.636moles
If 4.04 g of nitrogen combines with 11.46 g of oxygen to produce a compound with a molar mass of 216.0g, what is the molecular formula of this compound?
N4O10
Find the empirical formula for 1.90% H, 67.6% Cl, 30.5% O
HClO
___ Al + ___ S8 ---> ___ Al2S3
16 Al + 3 S8 ---> 8 Al2S3
Find the grams in 1.26 x 10-4 mol of HC2H3O2
0.00717
Find the mass in 2.6 mol of lithium bromide
226.044
The molar mass of a compound is 92 g. Analysis of the sample indicates that it contains 0.606 g N and 1.390 g O. Find the compound’s molecular formula
N2O4
Find the empirical formula for 60% C, 13.3% H, 26.7% O
C30H79O10
___ CH3CH2CH2CH3 + ___ O2 ---> ___ CO2 + ___ H2O
2 CH3CH2CH2CH3 + 13 O2 ---> 8 CO2 + 10 H2O
What is the volume of 0.05 mol of neon gas at STP
1.12
Determine the volume in liters occupied by .03 moles of a gas at STP
.672 liters