The answer should be B: -3
What I can’t understand I’m American
Calcium is in group 2A because it has two valence electrons and an oxidation state of 2+. Hope this is accurate & helpful! Enjoy your evening.
Yes. They are called compound machines because two or more simple machines were combined to create it.
Hello!
The exercise doesn't say the final temperature, but we are going to assume that the increase is of 20 °C (The procedure is the same, just change the final temperature) To calculate the heat absorbed by water, we need to use the equation for
Heat Transfer, in the following way (assuming that the heat increase is 20°C):

So, the Heat absorbed by water is
1297,04 J
Have a nice day!