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aleksandrvk [35]
3 years ago
6

In a coupled reaction, energy needs to be created to drive a second reaction forward. True or false

Chemistry
1 answer:
erastovalidia [21]3 years ago
5 0

Answer:

I would say false.

Explanation:

Hope it helps:)

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How many 20.0-g ice cubes are required to absorb 47.0 kJ from a glass of water upon melting?
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Hello!


The number of 20-g ice cubes required to absorb 47 kJ from a glass of water upon melting is 7 icecubes


Why?


We are going to clear from the equation of the released heat, the mass of ice (m). The specific latent heat of fusion of ice is 336 kJ/kg:


Q=m*L\\ \\ m=\frac{Q}{L}=\frac{47 kJ}{336 kJ/kg}=0,1399 kg=139,88 g\\   \\ 139,88g*\frac{1 icecube}{20g}=6,99=7icecubes


So, 7 ice cubes are required to absorb that amount of heat from the glass of water.


Have a nice day!

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