Chemistry

Grade-9

Easy

Question

# A certain amount of gas at 25^{o}C and 76cm Hg occupies a volume of 12.0L. What will be the pressure at a height where the temperature is 10^{o}C and the volume is 12.8L?

- 67.66 cm
- 67 cm
- 85 cm
- 87 cm

Hint:

### Use combined gas law.

## The correct answer is: 67.66 cm

### Let,

Pa = 76 cm Hg and Pb is unknown.

Va = 12 L and Vb = 12.8 L

Ta = 25°C = 298 K and Tb = 10°C = 283 K

Pb = 67.66 cm Hg

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