In an experiment similar to the one you just completed analyzing your salt\'s co

Question

In an experiment similar to the one you just completed analyzing your salt's composition, student teams in another course prepared magnesium sulfate crystals. Students analyzed their salts then prepared the class data table shown below. From this data, calculate the average percent composition (by mass) of water in the hydrated salt.

Starting

Constant

team

Mass of sample (g)

Mass after heating (g)

ace

3.274

1.583

bean

2.189

1.08

geek

4.349

2.103

not

4.338

2.118

winky

2.072

1.022

a.

51.2%

b.

Not enough information is given to determine the % composition of water in the salt.

c.

48.74%

d.

105%

e.

95.3%

Starting

Constant

team

Mass of sample (g)

Mass after heating (g)

ace

3.274

1.583

bean

2.189

1.08

geek

4.349

2.103

not

4.338

2.118

winky

2.072

1.022

Explanation / Answer

Calculation of average mass% water in MgSO4 sample

MgSO4.xH2O

mass% = (average mass water/average mass sample) x 100

from the data given above,

average mass sample = 3.2444 g

average mass water = sum(mass sample - final mass)/5 = 1.6632 g

therefore,

mass% water = (1.6632/3.2444) x 100 = 51.264%

Answer,

a. 51.2%

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