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defon
3 years ago
13

Calculate the mass percentage of the sulfate ion in MgSO4.

Chemistry
1 answer:
andriy [413]3 years ago
6 0

Answer:

The answer to your question is 80%

Explanation:

Data

mass percent of SO₄⁻²

molecule  MgSO₄

Process

1.- Calculate the molecular mass of magnesium nitrate

molecular mass = (1 x 24) + (1 x 32) + (4 x 16)

                           = 24 + 32 + 64

                           = 120 g

2.- Calculate the molecular mass of sulfate ion

molecular mass = (1 x 32) + (4 x 16)

                          = 32 + 64

                          = 96

3.- Write a proportion to solve this problem

                    120 g of MgSO₄ ---------------- 100 %

                      96 g of SO₄⁻²   ---------------  x

                      x = (96 x 100) / 120

                      x = 80 %                  

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grandymaker [24]

Answer:

1. 136 °C.

2. 0.21 atm.

Explanation:

1. Determination of the new temperature in °C.

Initial volume (V1) = 1.35L

Final volume (V2) = 1.95L

Initial temperature (T1) = 283 K

Final temperature (T2) =...?

Using the Charles' law equation, the new temperature of the gas can be obtained as follow:

V1 /T1 = V2 /T2

1.35/283 = 1.95/T2

Cross multiply

1.35 × T2 = 283 × 1.95

1.35 × T2 = 551.85

Divide both side by 1.35

T2 = 551.85/1.35

T2 = 408.8 ≈ 409 K

Finally, we shall convert 409 K to °C. This can be obtained as follow:

T (°C) = T(K) – 273

T(K) = 409 K

T (°C) = 409 – 273

T (°C) = 136 °C

Therefore, the new temperature of the gas is 136 °C.

2. Determination of the new pressure.

Initial pressure (P1) = 1.34 atm

Initial volume (V1) = 267 mL

Final volume (V2) = 1.67 L

Final pressure (P2) =.?

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1 L = 1000 mL

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1.67 L = 1.67 L × 1000 mL / 1 L

1.67 L = 1670 mL

Therefore, 1.67 L is equivalent to 1670 mL.

Finally, we shall determine the new pressure of the gas as follow:

Initial pressure (P1) = 1.34 atm

Initial volume (V1) = 267 mL

Final volume (V2) = 1670 mL

Final pressure (P2) =.?

P1V1 = P2V2

1.34 × 267 = P2 × 1670

357.78 = P2 × 1670

Divide both side by 1670.

P2 = 357.78 / 1670

P2 = 0.21 atm.

Therefore, the new pressure of the gas is 0.21 atm.

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