- #1

Richie Smash

- 293

- 15

## Homework Statement

A liquid A initially at temperature T1= 28.4°C, is heated by an immersion heater in container. The resulting temperature T2 is recorded at 1 minute intervals and the following results obtained.

(I will post a picture)

(a) Complete the table by computing temperature changes ΔT=T2-T1

I've done this and the missing values are: 7.6, 14.7, 24.1, 32.1,40.6,46.7,55.9 degrees Celsius.

(b) Plot a graph of ΔT against time (t). I've also done this.

(c) Find the slope S of the graph, I've also done this and I got 8.33.

(d) Cp the Specific Heat capacity of the liquid is related to the slope S by : Cp=2000/S J Kg

^{-1}K

^{-1}.

Find the Specific Heat Capacity of the Liquid.

I've also done this and got 240.1J Kg

^{-1}K

^{-1}.

(e) What would be the temperature of the liquid after 12 minutes?

This is where I'm stuck.

## Homework Equations

Eh=m*C*ΔT

## The Attempt at a Solution

I'm really stuck, I was thinking now I have the specific heat capacity i could find the energy supplied, then relate that to the temperature change but I don't have the mass. They basically want X°C-28.4°C and that would give you the temperature change after 12 minutes then simply add to the initial temperature to get the final.

But I'm pretty unsure I've been racking my brain looking for formulas linking temperature and time.

#### Attachments

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