How much heat is released when 40.0 g of ethanol cools from −120 °c to −136 °c? a.640 j b.580 j c 320 j d.290 j

Hello there! Your answer is A. 640 J

You can get this by subtracting the temperatures (-136-120= -256.) Then, you divide this answer by 40.0 g to get 6.4.

 a. 640 J

Explanation:

Q= heat gained  or released

m= mass of the substance = 40 g

c = heat capacity of  solid ethanol= 1.0 J/g ° C      

Thus heat released when 40.0 g of ethanol cools from −120 °C to −136°C is 640 Joules.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.