The r.m.s velocity of oxygen molecules at 27°C is 318 m/s. the r.m.s velocity of hydrogen molecules at 127°C is
1470 m/s
1603 m/s
1869 m/s
2240 m/s
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By what percentage should the pressure of a given mass of a gas be increased so as to decrease its volume by 10% at a constant temperature?