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WorksheetsStoichiometry Review Regents
Total questions: 18
Worksheet time: 42mins
Name
Class
Date
1.
The gram molecular mass of Ca3(PO4)2 is
a)
246 g
b)
279 g
c)
310 g
d)
342g
2.
What is the mass in grams of 5.90 mol C8H18?
a)
.0512 g
b)
19.4 g
c)
673 g
d)
389 g
3.
36.0 g of Be contains how many moles?
a)
0.25 mol
b)
4.0 mol
c)
45 mol
d)
320 mol
4.
What is the percent composition by mass of magnesium in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
5.
The students measured length during a science experiement, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?
a)
15.79%
b)
18.75%
c)
2.25%
d)
18%
6.
How many moles are in 3.01 x 1022 atoms of magnesium?
a)
0.05 moles
b)
1.81 x 1046 moles
c)
5.00 x 1021 moles
d)
5 moles
7.
What is the empirical formula of the following molecular formula: C3H6
a)
C3H6
b)
CH2
c)
C2H4
d)
CH3
8.
What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?
a)
C2H5
b)
C4H10
c)
C8H15
d)
C4H8
9.
What is the empirical formula if you have 88.80% copper and 11.20% oxygen?
a)
Cu3O8
b)
CuO4
c)
Cu2O
d)
Cu4O10
10.
If 15.6 g of hydrate are heated and only 11.7 g of anhydrous salt remain, calculate the % of water lost.
a)
25.9%
b)
19.2%
c)
37.9%
d)
76.3%
11.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62
b)
38
c)
24
d)
14
12.
how many grams of potassium react with 16 grams of oxygen to produce 94 grams of potassium oxide
a)
78
b)
111
c)
16
d)
94
13.
In the reaction 2RbNO3 → 2RbNO2 + O2, how many moles of O2 are produced when 5.0 mol of RbNO3 decompose?
a)
1.0 mol
b)
2.5 mol
c)
3.0 mol
d)
7.5 mol
14.
1 mol Ag contain................................. atoms Ag
a)
6.023 x 1023
b)
6.023 x1024
c)
6.023 x 10-23
d)
6.023 x 10-24
15.
How many molecules are in 2.50 moles of H2O? (moles to molecules)
a)
1.51 x 1024 molecules of H2O
b)
4.15 x 10-24 molecules of H2O
c)
3.01 x 1024 molecules of H2O
d)
8.31 x 10-24 molecules of H2O
16.
Find the grams of 0.75 moles of (NH4)3PO4?
a)
101.75 g
b)
121.75 g
c)
111.75 g
d)
131.75 g
17.
N2 + 3H2 --> 2NH3
What is the total number of moles of NH3 produced when 10 moles of H2 reacts completely with N2?
What is the total number of moles of NH3 produced when 10 moles of H2 reacts completely with N2?
a)
6.7
b)
2.0
c)
3.0
d)
15.0
18.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
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