What is the mass percent of carbon in a hydrocarbon with the formula c7h3o4

An aqueous solution of calcium hydroxide is standardized by titration with a 0.120 m solution of hydrobromic acid. if 16.5 ml of base are required to neutralize 27.5 ml of the acid, what is the molarity of the calcium hydroxide solution?

0.66y = 0.9x + 0.48 if y has a value of 108.45 what is the value of x?

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?