Question

Can someone check my specific heat answer?

Answer 1

32.2-100.3=-68.1
C= -822.6j= (25.605)(-68.1)
=2187.8j/(g x °C)

Answer 2

@aaronq can you help me again?

Answer 3

hm, you first need to find the heat exchanged. This is measured through the change in temperature of the water.

Answer 4

Okay so would it be 25.3-32.2?

Answer 5

6.9?

Answer 6

it's actually 32.2-25.3, not the reverse. Because \(\Delta T=T_f-T_i\)

(this is important because the sign confers where the energy is going)


but yeah 6.9 celsius is right.

Answer 7

221.6?

Answer 8

i got

4.18 J/g/C*6.9 celsius *24 g*=692.208 J

Answer 9

Okay you're probably right. Do you know how find out what kind of metal this is?

Answer 10

I have to answer this question

Using the experimental specific heat capacity value that you determined in Part II of the lab, what is the most probable identity of the metal that you examined?

Answer 11

you can by identifying the specific heat capacity

Answer 12

How do I do that?

Answer 13

this is the exact the same problem you had previously.

use \(q=m*C_p*\Delta T\)

Answer 14

So the mass would be 25.605 right?

Answer 15

692.208 would be the cp?

Answer 16

and ΔT would be the change in temp but what two numbers would i use?

Answer 17

@aaronq

Answer 18

oh it would be 6.9!

Answer 19

is the metal at an initial temp of 100.3 celsius?

Answer 20

no it gets heated up to that

Answer 21

by the water?

Answer 22

yes

Answer 23

i don't think thats right. i think the metal was introduced into the calorimeter at 100.3 celsius, then the temp decreased to 32.2 celsius.

Answer 24

Okay you're probably right

Answer 25

so you end up with \(692.208 ~J=(25.605~g)*C_p*(32.2-100.3)^{\circ}C\)

Answer 26

what is the cp?

Answer 27

specific heat capacity...

Answer 28

and what is the number? i dont know what that is

Answer 29

C is for capacity, the subscript P means that it's a value held at constant pressure

Answer 30

use some algebra to find the value

Answer 31

I'm very confused

Answer 32

hm which part is not clear?

Answer 33

I just need to figure out what the metal is

Answer 34

did you find the specific heat capacity?

Answer 35

No, i dont know the equation

Answer 36

i wrote it a few posts ago.

692.208 J=(25.605 g)*Cp∗(32.2−100.3)∘C

Answer 37

I got -1743.7

Answer 38

damn, it should've been -692.208 J

even so, your value should only be wrong by the sign.

you mustve made a mistake

Answer 39

i got 0.3969 J/g*C

Answer 40

Okay and how do i find the metal using that?

Answer 41

you need a table with their values to compare it. Did they give you one?

Answer 42

i would go with Ni because it's closest

Answer 43

Okay thank you!

Answer 44

no problem !