I need help with number 11 a-f please

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Stage in which a star’s outer layers have started to cool and grow outward?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules