Hello,

From the Ideal Gas equation,

P V = n R T = ( given mass, w / molar mass, m ) R T

1 × V = ( 12 / 120 ) × R × (273+t)    ----- (i)

1.1 × V=  ( 12 / 120 ) × R × ( 273 + t + 10 ). ----- (ii)

Dividing equation (ii) by equation (i), we get

1.1 = (273+t+10) / ( 273+t+)

or  t = −173 degree Celsius

I hope you find the answer helpful.

Thank you.