DUE TOMORROW! What is the percent yield of water vapor when 18.6 grams of water are produced when 17.9 grams of propane (C3H8) burns in oxygen? Round to two decimal places.

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.

How many grams of sodium chloride are in 250ml of a 2.5m naci solution