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AveGali [126]
3 years ago
13

Helium is considered a noble gas because it has a ________ valence electron shell save

Chemistry
1 answer:
castortr0y [4]3 years ago
8 0
Because it’s outermost ( actually , it’s only )
shell is full. The next shell holds 8 but it’s case it’s 2
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Calculate the heat change involved when 2.00 L of water is heated from 20.0/C to 99.7/C in
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Answer:

669.48 kJ

Explanation:

According to the question, we are required to determine the heat change involved.

We know that, heat change is given by the formula;

Heat change = Mass × change in temperature × Specific heat

In this case;

Change in temperature = Final temp - initial temp

                                       = 99.7°C - 20°C

                                       = 79.7° C

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                      = 669,480 joules

But, 1 kJ = 1000 J

Therefore, heat change is 669.48 kJ

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