How many moles are it 68.50 g h2so4? (molar mass = 98.09 g/mol)

0.698mol

Explanation:

Mole of a substance= Massof the substance/Molar Mass of the substance

Mass of H2SO4 = 68.50g

Molar mass of H2SO4= 98.09g/mol

Mole of H2SO4 = 68.50/98.09

Mole of H2SO4 = 0.698mol

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied