Question

question 26 := multiple choice question
how much energy would be produced if 1.5 kg of mass was completely converted into energy?
3.4 x 10^14 j
1.4 x 10^17 j
3.4 x 10^10 j
1.5 x 10^13 j
question 27 := multiple choice question
how many neutrons does _{17}^{35}cl have?
8.5
18
35
17

Explanation:

Step1: Recall energy - mass formula

$E = mc^{2}$, where $m = 1.5$ kg and $c=3\times10^{8}$ m/s.

Step2: Calculate energy

$E=1.5\times(3\times 10^{8})^{2}=1.5\times9\times10^{16}=1.35\times10^{17}\approx1.4\times10^{17}$ J.

Step3: Recall neutron - proton relationship

For $_{17}^{35}Cl$, number of neutrons = mass number - atomic number.

Step4: Calculate neutrons

$35 - 17=18$.

Answer:

Question 26: 1.4×10¹⁷ J
Question 27: 18