The compound XCl4 contains 74.8% Cl by mass. What is the element X?

Scientist wants to react a barium chloride salt with an acid. to speed up the reaction, the scientist crushes the barium chloride salt until it is a fine powder. this speeds up the reaction by a. increasing the ph of the salt. b. increasing the surface area of the salt. c. increasing the pressure of the salt. d. increasing the temperature of the salt. im thinking more a not 100% sure

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Idon’t know how to solve this question