Help again...?

Question

1. A total of 54.0 cal of heat are absorbed as 58.3 g of lead is heated from 12.0° C to 42.0° C. From these data, what is the specific heat of lead?



2. A 25.0 g block of rhenium metal (specific heat = 0.0329 cal/ g° C) is heated from 25.0° C to 88.2° C. How much energy is required to heat the block of rhenium?



3. The specific heat of ethanol is 2.46 J/g oC. Find the heat required to raise the temperature of 193 g of ethanol from 19oC to 35oC.


4. A sample of mercury metal is heated from 25.5° C to 52.5° C. It took 187 cal of heat to make this temperature change. What mass of mercury was in the sample? The specific heat of mercury is 0.033 cal/ g° C




Thanks everyone!

I did try...I just cant seem to get the answer
=/

Answer 1

The formula you need for all of these is

Q = m c ΔT

where

Q is the heat added or removed
m is the mass
c is the specific heat
ΔT is the change in temperature

In all of your problems, you are given three of these four parameters; solve for the fourth. Note that a negative Q simply means that heat was removed; a positive Q means that heat was added. ΔT is Tfinal - Tinitial.

Answer 2

do it yourself, if you ask that many questions at a time, then ur probably not trying at all.