In this question, we need to evaluate the ability to form electrolytes from the given compounds in the question, this is because when a compound is considered to be a strong electrolyte, this means that it will give a lot of ions into the solution and make the solution conduct electricity, so from the given compounds we have:
HCl = is an acid and in a solution it will totally dissociate, being considered a strong electrolyte, therefore it will complete the circuit
Sucrose = is a nonelectrolyte, not dissociating and forming ions, therefore sucrose will not complete the circuit
NaNO3 = same case as HCl, strong electrolyte
(NH4)2SO4 = same case as HCl, strong electrolyte
Answer it will be Sucrose
The formula to use---> specific heat= heat/ (mass x ΔT)
mass= 225 grams
ΔT= 25.0 C
heat= ? (missing)
in calorimeter problems, the concept that we have to understand is that heat (energy) is not formed or created but transferred. In other words, the heat lost by the unknown metal is the same amount of heat gained by the water. So, if we calculate the heat gain by the water is the same heat of the metal and we can plug it into our formula.
heat= mass x specific heat x ΔT
mass= 125 grams
specific heat= 4.184 joules/gC or 1 calories/gC
ΔT= 12.5C
heat (in joules)= (125 grams)x(4.184 j/gC)x(12.5C)= 6540 joules
heat (in calories) (125 grams)X(1 cal/gC)x(12.5C)= 1560 calories
now we can use these values for the heat of the metal in the specific heat formula:
specific heat of metal= 6540 joules/ (225 grams x 25.0C)= 1.16 j/gC
or in calories
specific heat of metal= 1560 calories/ (225 grams x 25.0C)= 0.277 cal/gC
I'd probably say a small object would be easier.
Answer:
Option 4 is the right of ur question