Question

7.5 x 10^4 J = 440 g (0.90J) (Tf- 19.5 C)

how do I rearrange this to solve for Tf?

Answer 1

Well first, divide both sides by 440(.90)g-J

Answer 2

And then add 19.5 to both sides.

Answer 3

thats it?

Answer 4

yep

Answer 5

what about in this case?
{155 g}{4.184 J} {Tf – 26C} = - {75 g} {4.184 J} { Tf – 95C}

Answer 6

Well then you have to use the distributive property and collect the terms that contain Tf

Answer 7

how?

Answer 8

\[155(4.184)(T-26)=-75(4.184)(T-95)\]

Answer 9

Let's divide both sides by 4.184 and be rid of that

Answer 10

divide or subtract?

Answer 11

\[155(T-26)=-75(T-95)\]
\[155T-4030=-75T+7125\]
\[230T=11155\]
\[Tf=48.5\]

Answer 12

Is it a factor or an addend?

Answer 13

If 4.184 is a factor divide it out. It it is an addend, subtract it. Which is it?

Answer 14

what calculation did you perform to get the 4030

Answer 15

and the 7125

Answer 16

Do you know how to use the distributive property?

Answer 17

155(T-26)=155 times T - 155 times 26

Answer 18

a(b+c) = ab + bc

Answer 19

Yep

Answer 20

ok i get it now. thanks for you patience

Answer 21

Also
-75(T-95)==-75 time T + 75 times 95

Answer 22

yw