If an atom is composed of 8 positively charged particles, and has a mass of 15 amu. What is the best conclusion?

What is the percentage of hydrogen in nitrogen trihydride

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Which of these is an intensive property of a substance