What is the percent by mass of carbon in C2H5OH?
52.1%C
Give the empirical formula that corresponds to terephthalic acid, C8H604.
C4H3O2
Calculate the molar mass of sodium nitride, Na3N.
82.976g/mol
Calculate the number of moles of calcium that contains the same number of moles as 2.00 moles of zinc.
2 moles of Calcium
What is the chemical formula of dintrogen monoxide?
N2O
What is the percent by mass of oxygen in Al2(CO3)3
61.54% Oxygen
A compound with the empirical formula CH2 was found to have a molar mass of approximately 84 g/mol. What is the molecular formula of the compound?
C6H12
Calculate the formula mass of magnesium sulfate.
120.37g/mol
Calculate the mass, in grams, of one molecule of the naturally occurring acid, oxalic acid.
1.50x10-22g
What is the name of NiCO3
Nickel(II)carbonate
Calculate the mass percent of EACH element in the MgC03, magnesium carbonate.
28.9% Mg
14.3% C
56.9% O
If 10.00 grams of copper metal is heated strongly in the air, the sample gains 2.52 grams of oxygen in forming an oxide. Determine the empirical formula of the oxide.
CuO
Calculate the molar mass of copper (ll) nitrate.
187.6 g/mol
Calculate the number of moles contained in 8.76 grams of strontium fluoride.
0.0697 mole
What is the chemical formula of calcium chloride?
CaCl2
Calculate the mass percent of EACH element in CH3CH2CH2CH2CH2C02H, caproic acid, an organic acid with a characteristic goat odor.
62.0% C
10.4% H
27.6% O
A compound consists of 65.45% C, 5.492% H, and 29.06% O on a mass basis and has a molar mass of approximately 110 g/mol. Determine the molecular formula.
C6H6O2
3.00 moles of an unknown element has a mass of 106.36 grams. What is the average atomic mass of the element and what is its identity?
35.453 g/mol, Chlorine
Calculate the number of grams of iron that contain the same number of atoms as 2.24 grams öf cobalt.
2.12g Fe
Name HBr
Hydrobromic acid
The weight percent of hydrogen in a compound with a formula, EH3, is 8.9%.
What is the atomic weight and probable identity of E?
30.9 g/mol Phosphorous
Transition metals can combine with carbon monoxide (CO) to form compounds such as Fe(CO)5 and Co(CO)8. Assume that you combine 0.125 grams of nickel with CO and isolate 0.364 grams
What is the value of x?
Ni(CO)4
Calculate the number of sulfur atoms present in 2.01 grams of sodium thiosulfate, Na2S203.
1.53x1022 atoms of S
What is the formula for sulfurous acid?
H2SO3