Answer:

Explanation:
The energy absorbed by the water is the energy it requires to evaporate. So:

The moles of water:

M is the water molecular weight


The energy absorbed:


<h3><u>Answer;</u></h3>
= 1.615 moles
<h3><u>Explanation</u>;</h3>
The molar mass of NO2
= 46.01 g/mol
The mass of NO2 given is 74.3 g
Number moles = mass/ molar mass
= 74.3 g/ 46.01 g/mol
= 1.615 moles
The answer is B. a flashlight uses a battery to operate.
The battery represents the chemical energy. This is converted into electricity, which is converted into light energy.
Answer:
physical
Explanation:
no chemical reaction is happening
Answer:
Cu+2AgNO3--->2Ag+Cu(NO3)2
Explanation: