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Irina-Kira [14]
3 years ago
12

If a sample contains 21.2g N how many moles of N does it contain

Chemistry
1 answer:
tigry1 [53]3 years ago
8 0

Hey there!

The molar mass of nitrogen is 14.007.

Convert grams to moles:

21.2 ÷ 14.007 = 1.51

The sample containing 21.2g of nitrogen contains 1.51 moles of nitrogen.

Hope this helps!

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Answer:

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We can go through each answer choice:

A. Since the ball rebounds at half the initial speed, there is a loss in kinetic energy. This is NOT an elastic collision.

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C. A reduced speed indicates that there is a loss of kinetic energy. This is NOT elastic.

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And the final as:

KE = 0 + \frac{1}{2}mv^2 = \frac{1}{2}mv^2KE=0+21mv2=21mv2

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