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statuscvo [17]
2 years ago
13

During an experiment, Stephanie found 4.5 mg of iron in a 750 g water sample. How many parts per million of iron are in the wate

r sample ?
Chemistry
1 answer:
lesya692 [45]2 years ago
5 0

Answer:

6ppm

Explanation

We'll begin by calculating the concentration of the solution in mg/g. This is illustrated below:

Mass of iron = 4.5mg

Mass of water = 750g

Concentration in mg/g = 4.5/750 = 6×10¯³mg/g.

Now, we can obtain the concentration in ppm as follow:

1mg/g = 1000ppm

Therefore, 6×10¯³mg/g = 6×10¯³ x 1000 = 6ppm.

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weqwewe [10]

Answer:

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Explanation:

First of all, sum all the pressures to know the total pressure in the mixture.

434 Torr + 389.9 Torr + 77.9 Torr = 901.8 Torr

Mole fraction = Pressure gas / Total Pressure

Mole Fraction H₂: 434 Torr /901.8 Torr = 0.48

Mole Fraction N₂: 389.9 /901.8 Torr =0.43

Mole Fraction Ar:  77.9 /901.8 Torr = 0.09

Remember: <u>SUM OF MOLE FRACTION = 1</u>

8 0
3 years ago
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