Convert 345 joules into calories. A. 82.5 cal
B. 1,440 cal
C. 82,500 cal
D. 1,440,000 cal

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.