Answer :
(3) [tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
(4) [tex]\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]
(5) [tex]P_1V_1=P_2V_2[/tex]
(7) [tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Explanation :
Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}\\\\P_1V_1=P_2V_2[/tex]
Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.
[tex]V\propto T\\\\\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
Gay-Lussac's Law : It is defined as the pressure of the gas is directly proportional to the temperature of the gas at constant volume and number of moles.
[tex]P\propto T\\\\\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]
Avogadro's Law : It is defined as the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature.
[tex]V\propto n\\\\\frac{V_1}{n_1}=\frac{V_2}{n_2}[/tex]
