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sp2606 [1]
3 years ago
12

What are fingerprints composed of, and how are they deposited?

Chemistry
1 answer:
zzz [600]3 years ago
4 0

Answer:

They are composed of patterns and ridge like characteristics. They are deposited by transferable oils such as perspiration.

Explanation:

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Hydrazine, N2H4, may react with oxygen to form nitrogen gas and water.
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Answer:

The percent yield of the reaction is 35 %

Explanation:

In the reaction, 1 mol of hydrazine reacts with 1 mol O₂ to produce 1 mol of nitrogen and 2 moles of water.

Let's verify the moles that were used in the reaction.

2.05 g . 1mol/ 32 g = 0.0640 mol

In the 100% yield, 1 mol of hydrazine produce 1 mol of N₂ so If I used 0.0640 moles of reactant, I made 0.0640 moles of products.

Let's use the Ideal Gases Law equation to find out the real moles of nitrogen, I made (real yield).

1atm . 0.550L = n . 0.082 . 295K

(1atm . 0.550L) / 0.082 . 295K = n → 0.0225 moles

Percent yield of reaction = (Real yield / Theoretical yield) . 100

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