An exothermic reaction releases 86.5 kJ. How many kilocalories of
energy are released?

Since 1 calories is 4.1858 Joules, 86.5kJ is 86.5 x (1/4.1858) = 20.66510583 kCal = 20.7 kCal (3 s.f)

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged