A gaseous compound is 78.26% boron and 21.74% hydrogen by mass. A 0.600-g sample of it occupies 487 mL at STP. What is the molecular formula for the gas

What is a metal replacement reaction

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Convert .347 kilometers to miles show your work