How many grams are there in 1.5x1025 molecules of hydrogen gas (H2)?

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

What is the number of moles in 15.0 g ash3?

Calculate the molarity of 48.0 ml of 6.00 m h2so4 diluted to 0.250 l .