A. 4% you divide 2000 to 500 and you get 4 which is your answer
Answer:
How much energy does it take to melt a 16.87 g ice cube? ΔHfus = 6.02 kJ/mol How much energy does it take to melt a 16.87 g ice cube? = 6.02 kJ/mol
A. 108 kJ
B. 102 kJ
C. 5.64 kJ
D. 936 kJ
E. none of the above
<em>5.64 kJ</em>
Explanation:
The Heat of fusion is the heat energy required to dissolve a given mass of ice at melting point.
<h3>
Step by Step Calculation</h3>
The heat energy required to dissolve ice can be calculated using the expression below;
Q = ΔH x m ...............................................1
where Q is the heat energy required;
ΔH is the heat of fusion for ice;
m is the mole
All the parameters above are provided in the question except m, so to get m we use the molar mass of water (also for ice) which is 18.01528 g/mol
.
<em>This means that 18.01528 g of ice is contained in one mole, therefore the mole for 16.87 g of ice is given as;</em>
m = 0.9364 mole of ices
Now the parameters are complete, we are given;
ΔH = 6.02 kJ/mol
m = 0.9364 mol
Q =?
Substituting into equation 1, we have
Q = 6.02 kJ/mol x 0.9364 mol
Q = 5.64 kJ
<em>Therefore, the energy required to melt 16.87 g of ice is 5.64 kJ</em>
Answer:
A) It will move at a different speed (i.e slower)
B) A vacuum
Explanation:
For A), Light moves at a different speed as it starts to interact more with the particles in said medium (in this case, water) than the earlier medium.
For B), Light propagates using its own particle, i.e the photon whereas sound is more of a transmission of energy from the particles it originates from. In a vacuum, there are no particles to transfer energy to, that is why light can travel in a vacuum and sound cannot
C or b because they both have the same product