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What is volume of n mole gas ? Derive the formula of combined gas low. |
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Answer» Solution :Volume of n mole gas : ..At constnat temperature and constant pressure any volume of n mole gas remains equal... because of - According to pV = nRT `therefore V = (nRT)/(p)=` constant….(Eq. - i) [`because` Taking close constant n, R, T, p] Combined gas equation : Ideal gas equation : pV = nRT `therefore (pV)/(T)=nR=` constant .....(Eq. -II) [`because n =` fixed mole and R = gas constant] This is the RELATIONSHIP for the simultaneous VARIATION of the variables. If temperature (T), volume (V) and pressure (p) of a fixed amount of gas vary from `T_(1), V_(1)` and `p_(1)` to `T_(2), V_(2)` and `p_(2)` then we can write - `(p_(1)V_(1))/(T_(1))=(p_(2)V_(2))/(T_(2))""`.....(Eq. -iii) This (Eq. -iii) is known as combined gas law. Uses : This equation have SIX variable. If out of six, values of five variables are known, the value of unknown variable can be calculated from the equation of combined gas. |
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