You have 163.8 g of phosphorus triiodide gas. What volume of gas do you have at STP?

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

All motion is caused by force? true or false

No copying 15 pts how does a free-body diagram tell you about the net force on an object?