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FrozenT [24]
3 years ago
7

Calculate the heat (in calories) released when 115 g of CHCl3 changes from a liquid to a solid at

Chemistry
1 answer:
Alexandra [31]3 years ago
4 0

Answer:  8855 Joules energy is released when 115 g of CHCl_3 changes from a liquid to a solid at  its freezing point.

Explanation:

Latent heat of freezing is the amount of heat released to convert 1 mole of  liquid to solid at atmospheric pressure.

Amount of heat released to freeze 1 gram of CHCl_3 = 77 J/g

Mass of CHCl_3 given = 115 gram

Heat released when 1 g of CHCl_3 is freezed = 77 J

Thus Heat released when 115 g of CHCl_3 is freezed =\frac{77}{1}\times 115=8855J

Thus 8855 Joules energy is released when 115 g of CHCl_3 changes from a liquid to a solid at  its freezing point.

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motikmotik

Answer:

13.7 moles of O₂ are needed

Explanation:

In order to find the moles of reactants that may react to make the products we need to determine the reaction:

Reactants are hydrogen and oxygen

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2 moles of hydrogen can react to 1 mol of oxygen and produce 2 moles of water.

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If 2 moles of hydrogen need 1 mol of oxygen to react

Therefore, 27.4 moles of H₂ must need (27.4 .1) / 2 = 13.7 moles of O₂

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