6.02 * 10ki power 20 molecules of urea are presentin 100ml of solution the concentration of urea solution is 

Asked by puneetgarg2555 | 22nd May, 2018, 07:16: AM

Expert Answer:

Given colon

No. of space molecules space of space urea space equals space 6.02 cross times 10 to the power of 20

Volume space of space solution space equals space 100 space ml

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 0.1 space litre.

We space know comma

No. space of space moles space equals space fraction numerator No. of space molecules over denominator Avogadro apostrophe straight s space no. end fraction

space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 6.02 cross times 10 to the power of 20 over denominator 6.022 cross times 10 to the power of 23 end fraction

space space space space space space space space space space space space space space space space space space space equals space 1 cross times 10 to the power of negative 3 space end exponent mol

Concentration space of space solution space in space mol divided by straight L space equals fraction numerator 1 cross times 10 to the power of negative 3 space end exponent mol over denominator 0.1 end fraction

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1 cross times 10 to the power of negative 2 end exponent space mol divided by straight L
 
The concentration of urea solution is  1×10-2 mol/L

Answered by Varsha | 22nd May, 2018, 09:45: AM