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Fiesta28 [93]
3 years ago
5

The heat of fusion of water is 80 cal/ g. How much energy is needed to melt 0.05 kg of ice?

Chemistry
1 answer:
Alex Ar [27]3 years ago
7 0
80 cal/ g is same as 80 calories in each 1 gram. so,

80 cal= 1 gram

first, we need to convert the kg into grams. all you have to do is multiply by 1000 or move the decimal three times to the right. 

0.05 kg= 50.0 grams

50.0 g (80 cal/ 1 gram)= 4000 calories

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What is the percentage composition when 10g of magnesium combines with 4g of nitrogen?
Ivanshal [37]
The %  composition   when 10g of magnesium combine   with  4g of   nitrogen  is  71.43%   magnesium   and  28.57 %  nitrogen

               calculation

%
  composition  =  mass  of an element  / total mass  x100
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calculate  the  total  mass  used

=  10g of  Magnesium  + 4 g of  nitrogen = 14 grams

%   composition for  magnesium  is therefore  =  10/14  x100 = 71.43 %

%  
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7 0
3 years ago
A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.24
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by  cross  multiplication

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6 0
3 years ago
Perform the following calculations and express the answer with the proper significant
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Answer:

The answer is

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8 0
2 years ago
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