The complete combustion of 15.0cm of a gaseous hydrocarbon X produces 60.0 cm of carbon dioxide gas and 75.0 cm’of water vapour. What is the molecular formula of X? (All
volumes are measured at the same temperature and pressure.)
O CaH6
O C4H10
ОСНа
ОС4Н10

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Don’t know. don’t care.look it up on google

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.