Question

The 64.8-g sample of the compound X2O5 contains 48.0 g of oxygen atoms. What is the molar mass of element X?

Answer 1

What do u think ?

Answer 2

i don't know i tried 5 times & continue to get the wrong answer

Answer 3

Mass of X2 = 64.8g - 48g right?

Answer 4

So the mass of X2 is 16.8g

Answer 5

Now we have to find the moles of oxygen

Answer 6

\[moles = \frac{ mass }{ molar mass} = \frac{ 48 }{ 16 } = 3moles\]

Answer 7

are u there?

Answer 8

yes

Answer 9

\[\frac{ 2 }{ 5 } = \frac{ xmoles }{ 3 }\]
\[x moles = 1.2\]
Now we know the moles of X2

Answer 10

okay..

Answer 11

we know the moles and the mass we just have to find the molar mass by using
molar mass = mass/moles

Answer 12

\[molar mass = \frac{ 16.8 }{ 1.2 } = 14gmol ^{-1}\]

Answer 13

YES thank you

Answer 14

Welcome !!!!!!!!! DId u get it ? :)

Answer 15

yes!