Chemistry 11: 1,2 and 3 Step Mole Conversions 3.3.2
Name:
Solve these conversions on a new sheet of paper showing all work, units and calculations. See pp126-126 in BC Chem 11
1.
Fill in the missing entries
i.
there are ______ moles of oxygen atoms per 1 mole of KMnO4
ii.
there are __________ moles of oxygen atoms per 3 moles of Ca(ClO3)2
iii.
there are _______ moles of hydrogen atoms per 7 moles of glucose, C6H12O6
iv.
there are _______ moles of carbon atoms per 12 moles of propane, C3H8
2.
Two Step conversions
i.
How many moles of H2O contain 20 g of hydrogen?
ii.
How many moles of sulphuric acid (H2SO4) contain 13.5 g
of oxygen?
iii.
How many moles of acetic acid (CH3COOH) contain 9.46 g
of hydrogen?
iv.
How many moles of carbon tetrachloride (CCl4) contain
19.96 g of chlorine?
3.
Using Three-Step conversions
i. How many oxygen atoms are in 2.5 g K2Cr2O7 ?
2.5 g K2Cr2O7
x
1 mol K2Cr2O7
__ g K2Cr2O7
x
__ mol O
1 mol K2Cr2O7
x
__ atoms O
__ 1 mol O
=
__ atoms O
__ 1 mol O
=
ii. How many oxygen atoms are in 13.40 g perchloric acid, HClO4 ?
13.40 g HClO4
x
1 mol HClO4
__ g HClO4
x
__ mol O
1 mol HClO4
x
Chemistry 11: 1,2 and 3 Step Mole Conversions 3.3.2
Name:
Solve these conversions on a new sheet of paper showing all work, units and calculations. See pp126-126 in BC Chem 11
iii. How many hydrogen atoms are in 3.75 g butane, CH3CH2CH2CH3 ?
3.75 g CH3CH2CH2CH3
x
1 mol CH3CH2CH2CH3
__ g CH3CH2CH2CH3
x
__ mol H
1 mol CH3CH2CH2CH3
x
__ atoms H
__ 1 mol H
4. More Three Step Conversions
i.
What mass of chlorine ions is contained in 2.35 x 1026 molecules of HCl ?
ii.
What mass of hydrogen ions is contained in 12.3 x 1025 molecules of H2O ?
iii.
What mass of oxygen ions is contained in 7.8 x 1024 molecules of nitric acid, HNO3?
iv.
What mass of nitrogen ions is contained in 3.28 x 1027 molecules of dynamite, also known as
TNT, which has the formula C7H5N3O6 ?
=