A closed system receives of energy by heating

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

A closed system receives

150\,\text{J}

of energy by heating. After the process the system's internal energy has increased by

60\,\text{J}

. Which of the following gives the magnitude and sign of the work associated with the process, using the standard convention? (a)

90\,\text{J}

, positive \,(work done on the system) (b)

210\,\text{J}

, positive \,(work done on the system) (c)

90\,\text{J}

, negative \,(work done by the system) (d)

60\,\text{J}

, positive \,(work done on the system)