What is the mass of 5.0 x 1021 molecules of water?
0.15 g of water
The term used for a compound that has a specific number of waters bonded to it.
Hydrate
What does the number 6.022 x 10^23 represent?
Avogadro's Number
What is the mass of 1.0 x 1012 molecules of O2?
5.3 x 10-11 grams of molecules
When all the water has been lost from the substance and only the compound is left.
Anhydrate
1 mole= (?) Molecules and 1 mole= (?) of the element
6.022 x 10^23 Molecules
Molar Mass of the Element
How many moles of hydrogen atoms are present in 2.0 moles of ammonia NH3?
6.0 mol
Analysis of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?
CH2
What is the mass of 1.000 mole of carbon atoms?
12.01 grams
Convert 2.3 x 1032 particles to moles of nitrogen.
3,819,329,127 moles or 3.819 x 109 moles
Convert Moles to Mass 1.25 moles of Nitrogen=____ grams
35.0 grams (since Nitrogen is diatomic multiply AMU by 2)
What is the molar mass of H2CrO4?
118 g
A sample of liquid contains 0.059% hydrogen and 0.94% oxygen. What is the empirical formula?
HO
Determine the hydrate formula from the following information. If 1.951 g BaCl2 · nH2O yields 1.864 g of anhydrous BaCl2 after treatment with sulfuric acid, calculate n.
BaCl2 · 2H2O
Convert 100 grams of C6H12O6 to molecules
3.341 x 1023 molecules
Convert 35.4 g of CuF2 to Atoms
2.06 x 1022 atoms
Acetic acid has the molecular formula CH3COOH. How many atoms of oxygen in 60 grams of acetic acid?
1.2 x 1024 atoms of oxygen
The empirical formula for a sample of liquid is HO. The molecular weight is 34.0 grams/mole. What is the molecular formula?
H2O2
Calculate the Hydrate formula based on the following information. A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?
MgCO3 · 5H3O