Correct statement or equation of a gas law (Boyle, Charles, Gay-Lussac, combined)

1. A.
   $\frac{P_1 V_2}{T_1} = \frac{P_2 V_1}{T_2}$
2. B.
   $n = \frac{RT}{PV}$
3. C.
   $\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}$
4. D.
   $p = \frac{RT}{nV}$

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1. A.
   $\frac{V}{T} = constant$ at constant pressure and for fixed mass of gas.
2. B.
   $\frac{P}{d} =$ constant at constant temperature and fixed mass of gas.
3. C.
   $\frac{P}{T} =$ constant at constant volume and fixed mass of gas.
4. D.
   $P \times V$ = constant at constant temperature and for fixed mass of gas.

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1. A.
   $\dfrac{1}{273} \times t$
2. B.
   $1 + 273 \times t$
3. C.
   $1 + \dfrac{t}{273}$
4. D.
   $\dfrac{1}{273 + t}$

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