can someone help with this chemistry Q

The equilibrium constant Kp for the Haber Process at 500 deg C is 1.5*10^-5 atm^-2.
Calculate the pressure required to convert half f the mixture of nitrogen and hydrogen in molar ratio 1:3 into ammonia at equilibrium at 500 deg
C.
thank you

physic Question


A block resting on a smooth horizontal floor is being pushed by a constant horizontal force.
the answer states that if the velocity at 1s is v, then the velocity at 2s will be 2v and the velocity at 3s will be 3v.
can someone explain why the velocity change from v to 2v and 3v ?
thank you
rgds

can someone help with this question

John went to a stationery shop to buy some pens. A fountain pen cost $6, a roller ball pen cost $3 while a ballpoint pen costs $0.10. John spent $100, buying 100 pens in total. How many roller ball pen did he buy?

can someone help with this question

Q>> a bag contains 200 marbles. there are 60 red, 60 blue, 60 green and the remaining 20 consists of some yellow and white. If marbles are chosen from the bag without looking, what is the smallest number of marbles one must pick in order to ensure that, among the chosen marbles, at least 20 are of the same colour?

Can someone explain this question on Geometric series

Sn = a*(1-r^n)/(1-r)

Question: For what values of the common ratio r will the sum to infinity of a geometric series exists?

Answer given: the sum of infinity of a geometric exists if and only if -1<r<1 and is equals to a/(1-r)

Doubt : why does the sum of infinity of a geometric does not exist if -1<r>1?
i thought the sum of infinity of the geometric series will be very large and exists in either -ve or +ve sum. OR could I have misinterprete the question?

can someone help with the below questions


How many zeroes does 50! end with?
How many zeroes does 2013! end with?

pinkapple:

archie2:

can someone help to solve this.

Q1> What is the unit digit in (243^10)(163^9)(633^8)?

answer: 7 :imcool:

http://www.facebook.com/photo.php?fbid=500572910002062&set=a.500572863335400.1073741830.466376010088419&type=1&relevant_count=1

thanks for the explaination
however when the power is high, the value has lots of zero at the back, say, does your method works for 3^50?

can someone help me again with this similar questions

Q1a>> what is the last digit of 7^128?
Q1b>> what is the last two digit of 7^128?
Q1c>> what is the last four digit of 7^128?
thank you

can someone help to solve this.

Q1> What is the unit digit in (243^10)(163^9)(633^8)?

Seeking help.

My girl in JH1 got problem with the subject "critical thinking"
Anybody (especially senior) care to let me have their old pass year work on this
subject for my review.
Please PM me