How much heat is released when 70.9g of water at 66c cools to 25c? the specific heat of water is 1 cal/gc

-12162.47 joules (or -12000 joules when accounting for significant figures)

Explanation (btw I used 1 cal as 4.184 joules because SI units are better):

q = m c delta T

q = (70.9) (4.184) (25 - 66)  

q = (70.9) (4.184) (-41)

q = -12162.47 joules

Yo sup??

1 lmole of O2 contains 22.4 litre

therefore 10.2 miles will contain

=10.2*22.4

=228.48 litre

Hence the correct answer is option D

Hope this helps