Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Medical
  • Rate constant of a first order reaction is <img alt="\mathrm{4.8 \times 10^{-3} \mathrm{~Hz}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B4.8%20%5Ctimes%2010%5E%7B-3%7D%20%5Cm

Rate constant of a first order reaction is \mathrm{4.8 \times 10^{-3} \mathrm{~Hz}} at a certain temperature. How long will it take for 75 \% of the initial quantity of reactant to decompose? (in seconds)

Option: 1

288.75 s


Option: 2

144.37


Option: 3

480.13


Option: 4

693.23


Answers (1)

\mathrm{\begin{aligned} \because \, \, t_{1 / 2} & =\frac{0.693}{k} \\\\ t_{1 / 2} & =\frac{0.693}{4.8 \times 10^{-3}}=144.375 s \\\\ t_{75 \%} & =2 \times t_{50 \%} \\\\ t_{75 \%} & =2 \times 144.375 \\\\ t_{75 \%} & =288.75 s \end{aligned}}

Posted by

Ramraj Saini

View full answer

NEET 2024 Most scoring concepts

    Just Study 32% of the NEET syllabus and Score up to 100% marks

Similar Questions

Trending Articles/News

anam-khan

‘Re-NEET must be secure, transparent and fool proof’: Dharmendra Pradhan at review meeting
anam-khan

NEET UG 2026 Re-exam on June 21; top medical colleges with lowest MBBS fees
anam-khan

Re-NEET Exam 2026 LIVE: Re-test on June 21; CBI probes NTA leak link, official guidelines, correction window

Latest Question