shikiaanthony
20.11.2020 •
Chemistry
Carbon has a half life of 5730 years, how many years would it take a 4 g sample to
decay to .5 g
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Ответ:
17190
Explanation:
half of 4 is 2 and half of 2 is 1 and half of 1 is .5 so you have now gone through 3 total half lives. Mulitply 5730 and 3.
Ответ:
8855 Joules energy is released when 115 g of
changes from a liquid to a solid at its freezing point.
Explanation:
Latent heat of freezing is the amount of heat released to convert 1 mole of liquid to solid at atmospheric pressure.
Amount of heat released to freeze 1 gram of
= 77 J/g
Mass of
given = 115 gram
Heat released when 1 g of
is freezed = 77 J
Thus Heat released when 115 g of
is freezed =
Thus 8855 Joules energy is released when 115 g of
changes from a liquid to a solid at its freezing point.