please help! gen chem question

[molar3]

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If a solution which is 0.50 M in compound X decomposes for 5.0 minutes at an average rate of 0.040 M . Min-1 , the new concentration of X will be?

it says the answer is 0.30M.....but i dont understand how! Does anybody understand this? Please help if you can!! thank you So much

 

[casper22]

The rate of decomposing is 0.04M per 1 min... thus in 5 minutes it will decompose 0.2 M (0.04M*5 min).

The new concentration will be 0.5M - 0.2M = 0.3M

I hope this helps..

 

[DQLEUCD]

If a solution which is 0.50 M in compound X decomposes for 5.0 minutes at an average rate of 0.040 M . Min-1 , the new concentration of X will be?

it says the answer is 0.30M.....but i dont understand how! Does anybody understand this? Please help if you can!! thank you So much

Should be easy if you think of it in terms of time elapsed.

so 1 minute u lose .04 2 minutes you lose .08..... 5 minutes you lose .2M

if you started with .5 M - .2M = .3M