By using the following reactions, calculate the heat of combustion of pentane:
c5h12 (g) + 8o2 (g) → 5co2 (g) + 6h2o (l).
c (s) + o2 (g) → co2 (g), δh = –395 kj
h2 (g) + 1/2o2 (g) → h2o (l), δh = –285 kj
5c (s) + 6h2 (g) → c5h12 (g), δh = –147 kj
–6.80 × 103 kj
–2.85 × 103 kj
–5.42 × 103 kj
–3.54 × 103 kj

Plz mark brainliest 30 points1) 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?

Draw any one of the skeletal structures of a 2° alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.

Find the mass, in grams, of 5.00*10^23 molecules of f2