Question

A glass of water contains 1.2 x 1024 molecules of water. An additional 5.0 moles of water are poured into the glass. How many molecules of water are in the glass?

Answer 1

• The answer is 4.211x10²⁴

Step-by-step explanation:

In one mol of molecules contains the Avogadro's number of molecules, which is 6,022x10²³ So when we poured 5 moles of water, we poured five times the Avogadro's number of molecules of water

5 x 6,022x10²³ = 3.011x10²⁴

Now we need to add that to the 1.2x10²⁴ molecules the glass of water contains

3.011x10²⁴+ 1.2x10²⁴=4.211x10²⁴

So in the end there are 4.211x10²⁴ molecules of water in the glass

Answer 2

We are given initially with 1.2 x 1024 molecules of water, added further with 5.0 moles of water. we are asked to determine the total number of molecules of water after the addition. We just convert the number of moles to number of molecules. 5 moles of water is equal to 3.011x 10^24 molecules. The total number is that we add the initial and the additional, equivalent to 4.211 x10^24 molecules.