Question

Find the number of moles for each mass of substance
15.3 g berryllium

Answer 1

Use this formula :)

moles(n) = mass(m) / molar mass (M)

You have mass (15.3g), Molar mass is found on the periodic table (9.012g/mol).

(If you put the answer I will give you a medal :) )

Answer 2

Oops its 53.8 g

Answer 3

Lol, still just calculate with 53.8g instead of 15.3g :)

Answer 4

so is it 53.8g Be* 1 mole be/18.024g Be

Answer 5

so far is that okay

Answer 6

Hmm no, n (moles) = 53.8/9.012 = 5.970

Answer 7

Oh the formula that other similar examples were going by this formula, so confusing

Answer 8

Well its the same formula you just have to re-arrange it according to the question :)

Answer 9

ooh

Answer 10

so moles is equal to 5.970
is that it?

Answer 11

Yup :)

Answer 12

So do I use the same formula with 6.79 g oxygen

Answer 13

You have to use the same moles(n) = mass(m) / molar mass (M)
But the molar mass will be different

Answer 14

The molar mass is found under the element on the periodic table :) http://www.ptable.com/

Answer 15

So i calculated it comes out to be 0.212mole 02

Answer 16

Yepp! :)