Nomenclature
PCl5
Phosphorus pentachloride
How many moles are present in 34 grams of Cu(OH)2?
0.35 moles
How many hydrogen atoms are present in 1 molecule of methane (CH4)?
4 hydrogen atoms
What is the mass percent of oxygen in water (H2O)?
88.8%
A compound is found to contain 0.4 moles C, 0.8 moles H, and 0.2 moles O. What is the empirical formula?
C2H4O
Dinitrogen trioxide
N2O3
What is the mass in grams of 6.02 x 1023 molecules of water (H2O)?
18.0 grams
How many carbon atoms are in 0.5 moles of glucose (C6H12O6)?
2 x 1024 atoms
What is the mass percent of carbon in glucose (C6H12O6)?
40%
A hydrocarbon contains 92.3% carbon and 7.7% hydrogen by mass. What is its empirical formula?
CH
HNO3
Nitric Acid
How many molecules are in 0.75 moles of NH3?
4.51 x 1023 molecules
What is the mass in grams of just the phosphorus present in 2.5 moles of calcium phosphate (Ca3(PO4)2)?
150 grams P
What is the mass percent of nitrogen in ammonium sulfate ((NH4)2SO4)?
21%
A compound with the empirical formula CH2O has a molar mass of 120 g/mol. What is the molecular formula?
C4H8O4
H2SO4
Sulfuric Acid
What is the mass in grams of 1.5 x 1024 atoms of oxygen (O)?
40. grams
How many oxygen atoms are present in 45 grams of nitric acid (HNO3)?
8.1 x 1025 oxygen atoms
What is the mass percent of chlorine in titanium(IV) chloride (TiCl4)?
74.8%
If the empirical formula is NO2, and it has a molar mass of 92.02 g/mol, what is the molecular formula?
N2O4
Chlorous Acid
HClO2
How many moles of carbon dioxide molecules are in 11.2 grams of CO2?
0.254 moles
What is the mass in grams of just the iodine atoms present in 125 grams of potassium iodide (KI)?
95.6 grams of I
In dinitrogen pentoxide (N2O5), nitrogen makes up 63.6% of the mass. What is the mass percent of oxygen?
36.4%
Find the molecular formula of a substance that contains 60.00% carbon, 4.48% hydrogen, and 35.52% oxygen and has a molar mass of 180.2 g/mol.
C9H8O4