How many grams is 2.40 x 1023 molecules of N, O,? (5 pts)
PLS HELP ASAP

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas