Which of these events leaves small pieces of rocks in new places? Wethering​

Which statement justifies that phosphine (ph3) is a polar molecule?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)