Vitamin D has a percent composition of 42.98% C, and 57.02% H. Its molecular mass is 780.68 g/mol. Find its empirical and molecular formulas. Show your work.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?