What is the volume of 19.87 mol of ammonium chloride (NH4Cl) at STP? A.
4.45 l

B.
445.088 l

C.
4.45088 × 1025 l

D.
4.54 × 1024 l

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

Why is the melting of ice a physical change ?

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?