A chemistry graduate student combines 3.90 grams of potassium and 12.7 grams of iodine to form potassium iodide. According to the law of conservation of mass, how much potassium iodide should be formed if the reaction proceeds to completion?

How many liters of water vapor can be produced if 108 grams of methane gas (ch4) are combusted at 312 k and 0.98 atm? show all work. pls ! will mark as brainliest

Is a chemical message sent by another individual.

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ