Molecular Formula
What is the molecular formula of a compound?
The formula that indicates the exact number of each element in a compound.
What is Avagrodo's number?
6.022 X 1023
The ....... of a substance is the mass (in grams) of 1 mol of the substance.
What is molar mass
What is the formula for finding the percent of an element in a compound?
% element= (mass of the element x # of elements)/ mass of the compound
What is a formula of a compound that expresses the smallest whole number ratio of the atoms present?
What is empirical formula
Determine the molecular formula of a compound with an empirical formula of NH2 and a formula mass of 32.06 grams.
N2H4
One mole of oxygen atoms represents how many atoms?
Avagrodos number; 6.022 X 1023
What is the molar mass of water?
18 g/ mol
Determine the mass percent of sulfur in sulfuric acid (H2SO4)
32.70%
What is the empirical formula of H2O2?
HO
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How many moles does 10 grams of aluminium have?
0.371 mol Al
What is the molar mass of calcium phosphate?
310.18 g/mol
A hydrocarbon has the formula C2H4. What is the percent by mass of carbon in the compound?
85.6%
What is the empirical formula for CCl4
CCl4
A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
C2H8N2
A chemical mole is equal to how many particles?
6.02 x 1023
Calculate the molar mass of a sample if a single molecule/particle weighs 5.34 x 10-23g
32.2 g/ mol
What is the mass percent of Hydrogen in penicillin C14H20N2SO4?
6.453%
What is the empirical formula for C6H12?
CH2
What is the molecular formula of benzoyl peroxide (the empirical formula is C7H5O2) if the molecular mass is 242 g/mol?
C14H10O4
Silicon has a mass of 5.68 x 10-3 g of Si, how many silicon atoms are present?
1.22 x 1020 si atoms
What is the molar mass of C12H22O11?
342.30 g/ mol
Determine the percentage of composition of H2SO4
H= 2.06%
S=32.69%
O=65.25%
SF2