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Percent Yield

Total questions: 16

Worksheet time: 43mins

Name
Class
Date
1.

When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

a)

90.4%

b)

104%

c)

96.15%

d)

1.04%

2.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
3.

What is the formula for percent yield?

a)

ActualTheoretical×100\frac{Actual}{Theoretical}\times100

b)

TheoreticalActual×100\frac{Theoretical}{Actual}\times100

c)

Actual×Theoretical100\frac{Actual\times Theoretical}{100}

d)

100Actual×Theoretical\frac{100}{Actual\times Theoretical}

4.

Which of the following reactions has the lowest percent yield?

a)

Theoretical yield 25.7 g; actual yield 23.2 g

b)

Theoretical yield 42.1 g; actual yield 39.9 g

c)

Theoretical yield 18.2 g; actual yield 15.6 g

d)

Theoretical yield 93.4 g; actual yield 87.9 g

5.

What is Percent yield?

a)

the percent of Carbon in a substance

b)

the percent ratio of actual yield to the theoretical yield

c)

the percent ratio of reacted and unreacted substances

d)

6.022 x 10^23

6.

48.86 g of cobalt is equal to how many moles of cobalt? (4 SF)

a)

2879 moles

b)

8.291 moles

c)

.8291 moles

d)

.829 moles

7.

What is the molar mass of PbSO4?

a)

303.262 g/mol

b)

255.262 g/mol

c)

163.872 g/mol

d)

372.262 g/mol

8.
7. The amount of product that actually forms when a chemical reaction is carried out in a laboratory is called the _________ yield.
a)
actual
b)
theoretical
c)
percent
9.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
10.
What is the molar mass of table salt (NaCl)?
a)
116.886 g/mol
b)
35.453 g/mol
c)
22.990 g/mol
d)
58.443 g/mol
11.

Converting from grams C2H18 to grams CO2 , the first conversion factor has grams of what on the bottom

a)

C2H18

b)

CO2

c)

O2

d)

H2O

12.

The middle conversion factor is the

a)

mole ratio of C2H18 to CO2

b)

molar mass of CO2

c)

molar mass of O2

d)

combination lock of your locker

13.
What is the molar mass of Hydrogen Peroxide (H2O2)?
a)

48.014 g/mole

b)

34.014 g/mole

c)

36.014 g/mole

d)

35.014 g/mole

14.
Balance this equation.
_CF+ _Br-- _CBr+ _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
15.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
16.
Balance this equation.
_SnO+_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1