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torisob [31]
3 years ago
15

The table shows the number of points scored by the winning men's jumping competition during the Olympics from 1980 to 2000. Afte

r the 2000 Olympics, the mean number of points scored by all winners since 1980 (inclusive) was 241.9. Which of the following choices must have been the winning number of points in 1992?
Chemistry
2 answers:
Neko [114]3 years ago
5 0

the answer is B 222.8

romanna [79]3 years ago
4 0

that would be 241.9 my friend!

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Copper(II) sulfate forms a bright blue hydrate with the formula CuSO 4 ⋅ n H 2 O ( s ) . If this hydrate is heated to a high eno
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Answer:

The value of n in the hydrate formula is 5 ,CuSO_4.5H_2O.

Explanation:

CuSO_4.nH_2O\rightarrow CuSO_4+nH_2O

Mass of hydrate of copper sulfate = 14.220 g

Moles of hydrate of copper sulfate =\frac{14.220 g}{(159.5+n\times 18) g/mol}

Mass of copper sulfate after heating = 8.9935 g

Moles of copper sulfate = \frac{8.9935 g}{159.5 g/mol}

\frac{14.220 g}{(159.5+n\times 18) g/mol}=\frac{8.9935 g}{159.5 g/mol}

Solving for n, we get:

n = 5

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