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Mars2501 [29]
4 years ago
15

How many grams are present in a sample of aluminum?

Chemistry
1 answer:
MrMuchimi4 years ago
5 0
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What is the number of moles in 40.0 L of He gas at STP?
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Answer: There are 1.78 moles in 40.0 L of He gas at STP

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 1 atm (STP)

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n = number of moles = ?

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n=\frac{PV}{RT}

n=\frac{1atm\times 40.0L}{0.0821Latm/K mol\times 273K}=1.78moles

Thus there are 1.78 moles in 40.0 L of He gas at STP

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