For an elementary reaction , `X(g)toY(g)+Z(g)`
the half life period is 10 min. In what period of time would the concentration of X be reduced to 10% of original concentration?

Options

A. `20 min`
B. `33 min`
C. `15 min`
D. `25 min`

Answer

B

Explanation

Use the formula: `(t_(10%("left")))/(t_(1//2)) = log((100)/(10))/(0.3)`
`t_(10%)("left") = (t_(1//2) xx 1)/(0.3)`
`= (10 min)/(0.3) = 33 min`.