3 years ago

Refer to the example about diatomic gases A and B in the text to do problems 20-28.

Chemistry

1 answer:

alekssr [168]3 years ago

8 0

Answer:

28g.

Explanation:

Hello,

In this case, considering the statement, we can infer that the monoatomic atomic mass of B is 14 g in one one mole. In such a way, since it is diatomic, we can notice that one mole of B2, is having 28 g of B2, as monoatomic atomic mass is considered twice.

Regards.

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How many moles of ethanol, C2H5OH, are in a sample which weighs 39.2 g? (Hint: your answer needs to be less than the 1 mole b/c

m_a_m_a [10]

Answer:

Explanation:

To find how many moles are in the sample, you first must calculate how much one mole of C2H5OH weighs.

2(mass of C) + 5(mass of H) + (mass of O) + (mass of H)

= 2(12.01) + 5(1.008) + (16.00) + (1.008) = 46.068 g/mol

So, now that we know what 1 mole weighs, we can simply divide the weight of the sample by the weight of a mole of ethanol to get our answer.

39.2 / 46.068 = approximately 0.851 mol of ethanol

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