Question

At 40∘C, the volume of a gas is 300mL. The temperature of the gas gets raised to 55∘C with no change in pressure. What is the new volume of the gas?​

Answer 1

Answer:

28°C

Explanation:

The correct equation to use with these kinds of questions is the Combined Gas Law.

P

1

⋅

V

1

T

1

=

P

2

⋅

V

2

T

2

This equation, though, is a little unnecessary at times because of the possibility of extra constants.

In this case you have a pressure constant which enables us to shorten your longer equation down to Charles' Law because pressure remains the same and doesn't affect the calculation.

V

1

T

1

=

V

2

T

2

The next step is to isolate the variable that you want, which is, in this case,

T

2

.

T

2

=

V

1

T

1

V

2

Now it is time to replace your known variables with numbers

T

2

=

350

m

L

⋅

45

°

C

400

m

L

And calculate...

T

2

=

28.125

°

C

Significant digits...

T

2

=

28

°

C