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Question 11 (4 points) What is the formula for the ionic compound formed by Mg2+ and N3−

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Question 11 (4 points) What is the formula for the ionic compound formed by Mg2+ and N3−

Question 11 options:

Multiple Choice

1.Mg3N2

2.Mg3N3

3,Mg6N4

4.Mg2N2

Question 12 (8 points)

A certain radioactive substance has a half-life of 1 hour. If you start with a 1024 g sample at noon, how much is left at 10:00 PM?

Answer to one decimal place please in grams

Question 13 (10 points)

The average person in US uses around 1.0*10^8 J of energy per year. If the USA population is 308 million.

Using Einstein’s famous formula, E = m c^2, find the energy that would be released if a 65 kg of an radioactive element were converted entirely into energy. (Hint> First calculate E=mc^2. c=3*10^8 m/s.). Then calculate how many years that amount of energy will last the USA.

You answer is in years. Answer in integers.

 
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