<span>D) Elements with the most valence electrons are in group 18.
Hope this helps!</span>
Answer:
This will need 715.806 J of heat energy to raise the temperature.
Explanation:
To calculate how much heat is needed to raise the temperature of any substance, you need:
The mass of the substance, m, which for you is 9g
The temperature change that occurs, ΔT, which for you is 19ºC.
The specific heat capacity of the substance, c (which you can look up here: http://www2.ucdsb.on.ca/tiss/stretton/Database/Specific_Heat_Capacity_Table.html
), (It is the amount of heat required to raise 1 gram of that substance by 1°C.)
For water, the value of c is 4.186J/g°C
Then, this is the equation you need:
ΔT
Where Q is the heat needed
So,
You need 715.806J to raise the temperature of water by 19ºC
i believe the answer you're looking for would likely 3.0 g because you don't need to add decimals which could like a singular digit. ex 3g
also applies for .2s i believe (don't quote me on that one)
Heart me if i helped good luck!