Questions LLC
Login
or
Sign Up
Ask a New Question
Science
Chemistry
Radioactivity
An element with mass 510 grams decays by 26.3% per minute. How much of the element is remaining after 7 minutes, to the nearest 10th of a gram?
2 answers
Let $M$ be the mass of the element at any given time. After 7 minutes, $M$ has decayed to $M\cdot(1-0.263)^7 = M\cdot 0.737^7\approx M \cdot 0.268$, which is $510\cdot0.268\approx \boxed{136.7}$ grams.
The answer is 60.2
You can
ask a new question
or
answer this question
.
Related Questions
A radioactive element decays exponentially according to the function Q(t) = Q0ekt
.If 100 mg of the element decays to 25 mg in 12
Consider this reaction involving an unknown element X. F2+2XBr = Br2+2XF When 5.200 g of XBr reacts, 2.896 g of Br2 is produced.
Elements A and B react according to the following balanced equation.
3A2+2B → 2A3B The molar mass of element A is 4g/mol. The
A 40.0g SAMPLE OF AN ELEMENT COMBINES COMPLETELY WITH ANOTHER ELEMENT TO MAKE 112.2 OF A COMPOUND. WHAT MASS OF THE SECOND
Elements A and B react according to the following balanced equation.
3A2 + 2B → 2A3B The molar mass of element A is 4 g/mol.
IF 80mg of a radioactive element decays to 10mg in 30 minutes, the half-life of this element is
a.10 min b.20 min c.30 min d.40
Which of the following statements about elements is false?
A. An element is a pure substance. B. An element is made up of
You find a compound composed only of element x and hydrogen,and know that it is 91.33% element x by mass. Each molecule has 2.67
Element X is a radioactive isotope such that every 86 years, its mass decreases by half. Given that the initial mass of a sample
Elements A and B react according to the following balanced equation. 3A2+2B → 2A3B3A2+2B → 2A3B The molar mass of element A
