5. A 25 kg object travels a distance of 90 m in 30 s. Find the momentum

★ v = d/t

★ v = 90/30

★ v =3

Acc to question

★ momentum = mass * velocity

★ m = 25×3

★ m = 75kgm/s

Hope it help

☆ Velocity = distance/ time travel

= 90/30

= 3 m/s

Then,

According, to question

momentum (m) = Mass* Velocity

= 25* 3

= 75kg.m/s

I hope you know this Answer.

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.