## Chemistry and Chemical Reactivity (9th Edition)

From the conservation of energy principle: $10\ g\times 0.129\ J/g.K\times (T-100)+$ $10\ g\times 0.385\ J/g.K\times (T-0)+$ $150\ g\times 4.184\ J/g.K\times (T-20)=0$ $1.29(T-100)+3.85(T-0)+627.6(T-20)=0$ $632.74\ T=12681$ $T=20.04^{\circ}C$