Question

How many individual oxygen atoms are contained in a sample of P2O5 that also

contains 0.620 moles of P? (Input your answer with scientific notation using "e-
notation and report your answer to two places past the decimal point. Moodle is
looking for a number only, no units.)

Answer 1

Step-by-step explanation:

Equation with given

P2O5 ====> 2P^5 + 5O-2

0.620 x

Solution

What you are going to do first is find the molar amount of oxygen. Use a proportion to do this

2/0.620 = 5/x Cross Multiply

2x = 0.620 * 5 Divide both sides by 2

2x/2 = 0.620 *5/2

x = 0.310 * 5 Combine

x = 1.55 moles of oxygen.

Now comes the answer. How many atoms are there in 1.55 moles of oxygen?

1 mole of anything contains 6.02 * 10^23 items of that mole

1.55 moles of oxygen contains x atoms of oxygen

1/1.55 = 6.02 * 10^23 / x Cross multiply

1*x = 1.55 * 6.02*10^23 Combine

x = 9.331 e 23

Answer

9.33e23