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The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is?

a) 0.0033/°C

b) 0.0025/°C

c) 0.0030/°C

d) 0.0021/°C

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