Given
#"The molar sp.heat at constant pressure "( C_p )= 35100/1000JK^-1mol^-1=35.1JK^-1mol^-1#
#gamma=C_p/C_v=1.31#
#"Where " C_v->"molar heat
capacity at constant volume"#
#C_v=C_p/gamma=35.1/1.31JK^-1mol^-1#
We know
#C_p-C_v=R->"Universal gas constant"#
#:.R=35.1-35.1/1.31=(35.1xx0.31)/1.31JK^-1mol^-1#
#~~8.3061JK^-1mol^-1#