QUESTION 1 Which equation involves using enthalpy of formation (AHC) values? Choose the best answer.
A) AH = En AHproducts - En AHreactants
B) q = CAT
C) AE-9+w
D) q-mCSAT

QUESTION 2
Calculate AHrxn of the following reaction:
2 NO(g) + 2 H2 (g) - N2(g) + 2 H20 (g) AHrxn = ???
Given the following AHf values:
NO (g) AH = 90, k]
H20 (1) AH = -286 kJ
H20 (g) AH = -242 kJ
A) -148 kJ
B) -752 kJ
C) -304 kJ
D) -664 kJ

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.