first order rate law decomposition?
2019-03-06 12:22 pm
How many grams of C will be left over after 75 minutes, if there are 10.0 g initially? for a first order rate law reaction where it takes 3.5 hours for 25 percent of C to decay?
回答 (1)
2019-03-06 12:35 pm
✔ 最佳答案
25% = 1/4 = (1/2)²The time taken is 2 half-lives.
Half-life = 3.5/2 h = 1.75 h = 1.75 × 60 min = 105 min
Number of half-lives for 75 min = 75/105 = 0.714
Mass of C left = 10.0 × (1/2)⁰˙⁷¹⁴ g = 6.10 g
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