# If the volume of a gas, at constant temperature, changes from 200 ml to 500 ml, the pressure on the gas must have changed from 400 torr to?

chemistry ?

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- Dr WLv 72 months ago
P1V1 = P2V2

P2 = P1 * (V1 / V2)

P2 = 400torr * (200mL / 500mL) = 160 torr

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- Roger the MoleLv 72 months ago
3. a) The volume increased, so the pressure must decrease.

b)

(400 torr) x (200 mL / 500 mL) = 160 torr

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- 2 months ago
The secret to passing whatever unit you're on in chemistry:

Memorize the following laws:

- Charles'

- Boyle

- Gay-Lussac

It's pretty much brainlessly inserting numbers into the calculator, you can do it

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- Your Friendly Neighborhood AsianLv 52 months agoReport
The unit is focused on ideal gases; it's virtually centered around these 3 laws

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- 2 months ago
They gave you the formula and 3 of the variables

P[1] = 400 torr

V[1] = 200 ml

V[2] = 500 ml

P[2] = x torr

400 * 200 = 500 * x

Solve for x

400 * 200 / 500 = x

4 * 200 / 5 = x

4 * 40 = x

160 = x

P[2] = 160 torr

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