Is the reaction si (s) + 2 h2 (g) --> sih4 (g) spontaneous under standard conditions at 298 k? answer this question by calculating delta-s(universe). the "system" is comprised of the reactants and products. a. what is delta-s(universe)?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

How many moles are in 43.9 l of oxygen

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.