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WorksheetsGRADE REPLACEMENT- Unit 1 and 2 (Moles and Stoich)
Total questions: 10
Worksheet time: 39mins
Name
Class
Date
1.
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
How many moles of oxygen are consumed if 8 moles H2 are used?
a)
2
b)
4
c)
6
d)
8
2.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
3.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
4.
SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)
96 g
b)
0.67 g
c)
2.67 g
d)
48 g
5.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
6.
How many grams in 2.41 moles of H2SO4
a)
27.33 grams
b)
13.56 grams
c)
19.93 grams
d)
236.37 grams
7.
1. Calculate the following in atoms …
B) 4.3 moles of He
a)
4.77 x 1021 atoms
b)
.007 mol
c)
2.58 x 1024 atoms
d)
1.8 x 10-6 atoms
8.
Molar Mass of (NH4)2SO4
a)
115 g/mol
b)
132.14 g/mol
c)
63.9 g/mol
d)
12.7 g/mol
9.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
10.
How many atoms of iodine are in 1 mole of iodine?
a)
53
b)
63.55g
c)
126.9
d)
6.02 x 1023
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