Potato97

For the 6 slots indicated, 17+17+17+17+16+16=100

Do you mean in how many ways the first 5 letters of the alphabet can be arranged? If that is the case, it is 5!=120.

Use v=u+at. 29.28=0+a(3) a=9.76 m/s^2

This is similar to the question you posted before, assuming that you are the same anonymous. Use v=u+ at once again. (Take 28 as your initial velocity.)

Total distance when train reaches end of bridge =(150+250)m =400 m s=vt 400=v(25) v=16 m/s

First, write out the equation: N2+3H2 <=>2NH3 No of mol of H2-> 3.41/2 =1.705 mol Ratio of NH3 to H2 is 2:3, Mol of NH3= (1.705/3)*2 =1.137 mol Mass=no of mol*molar mass =1.137*(14+3) =19.3g