nomenclature
How would you write sulfur dioxide?
SO2
What is the molar mass of (NH4)2HPO4?
132.06 g/mol
What is the difference between empirical and chemical formulas?
empirical: a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
molecular: a formula giving the number of atoms of each of the elements present in one molecule of a specific compound.
How many moles of O are there in 2.7 moles NO3?
8.1 moles O
(NH3)4PO4
How many moles are in 17.5 g of (NH4)2HPO4? (MM = 132.06g/mol)
0.133 moles
→ how many moles of hydrogen are there in one mole of (NH4)2HPO4?
What is the empirical formula of C3H12O27?
CH4O9
If you have 0.0153 moles of CO2, how many molecules of CO2 do you have?
9.21 x 1021 molecules CO2
→ how many atoms of O do you have?
1.84 x 1022 atoms O
How would you write potassium dichromate?
K2Cr2O7
→ what about rubidium chromate?
In comparing a balloon containing 25 grams of helium to a balloon containing 25 grams of neon, which has more atoms?
helium
Determine the empirical formula of polystyrene which is 92.3% C and 7.7% H. (Atomic weights: C = 12.01, H = 1.008)
CH
The analysis of 5.00 g of a compound showed that it contains 4.44 g of oxygen and 0.56 g of hydrogen, calculate its % H & O %
11.1% H 88.9% O
how do you write perchloric acid
HClO4(aq)
How many nitrogen atoms does one mole of nitrogen gas contain?
1.69 x 1025 N2 atoms
Determine the molecular formula of a compound with the empirical formula CH2O and a molar mass of 180 g/mol.
C6H12O6
Name whether the following are ionic or covalent:
Fe2O3, CCl4, NI3, CBr4, H2O
how is iron (III) dichromate written?
Fe2(Cr2O7)3
You have 25.0 g of Na, Cu, C, Pb, and Ne. Which contains the largest number of moles?
C
Determine the empirical formula for a compound composed of 60% C, 4.5% H, and 35.5% O
C9H8O4