6. Which of the following isotopes has the same
number of neutrons as phosphorus-31?
a. 32P
b. 32S
c. 28Si
d. 29Si

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.

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)

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver