Question

What do u mean by saying specific heat of lead is 0.03

Answer 1

Answer:

40.9 k g  lead

Explanation:

The equation you want is

E = m c θ

where  E  is energy,  m  is mass,  c  is specific heat capacity (SHC) and  θ

is the change in temperature (note: change).

In the question, we want to find mass, so we rearrange to make mass the subject:

E = m c θ → m = E c θ

We know that  

E = 93.4 J ,  c = 0.129 J g K  and  θ = 40− 22.3 = 17.7K  

(We can easily convert between  K

and Celsius because they are on the same scale, but have different starting points. Celsius starts from water freezing at  

0 oC , while Kelvin starts at  0

thermal energy, which is about  − 273.15 o C . Calculating a change in Celsius gives the same change in Kelvin, because you can ignore the starting points of the scales.)

Now we have

m = 93.4 0.129 × 17.7 =  40.9057 k g