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laila [671]
3 years ago
14

Calculate the grams of calcium present in 70 grams of calcium chloride.

Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

Answer:

37.1g of Ca

Explanation:

Hello,

Molecular formula for calcium chloride = CaCl

Molar mass = 40 + 35.5 = 75.5g/mol

Assuming there's one mole of CaCl

1 mole = mass / molar mass

Mass = 1 × 75.5

Mass = 75.5g

75.5g of CaCl contains 40g of Calcium

70g of CaCl will contain x g of Calcium

X = (70 × 40) / 75.5

X = 37.086g

Therefore, 70g of CaCl contains approximately 37.1g of Ca

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If irons temperature goes from 50c to 75c in a 20g sample, how many joules of heat were used?
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Answer:

Option D. 230 J

Explanation:

We'll begin by calculating the temperature change of the iron. This can be obtained as follow:

Initial temperature (T₁) = 50 °C

Final temperature (T₂) = 75 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 75 – 50

ΔT = 25 °C

Thus, the temperature change of the iron is 25 °C.

Finally, we shall determine the amount of heat energy used. This can be obtained as follow:

Mass (M) = 20 g

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Specific heat capacity (C) = 0.46 J/gºC

Heat (Q) =?

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Q = 20 × 0.46 × 25

Q = 230 J

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3 years ago
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I hope this helps.  Let me know if anything is unclear.



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Answer:

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