1) A sample of sodium dichromate, Na2Cr2O7, contains 0.414 moles.  2) A sample of dinitrogen trioxide, N2O3, contains 2.078 moles.  How much does the sample weigh, in grams?

3) A sample of potassium sulfate, K2SO4, weighs 75.43 grams.  Convert this moles.

Be sure to include a unit with your answer.

4) 2,4,6-trinitrotoluene, better known as TNT, is used as an explosive.  TNT has the formula C7H5(NO2)3. Convert a sample of TNT that weighs 36.22 grams to moles.

Be sure to include a unit with your answer.

(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

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