Question

help

Answer 1

I need someone to help me check my work and I don't get number 2

Answer 2

yeah thats good but try to show your dimensional analysis better

Answer 3

@sasquat i got the answer for 2 and 3but u think u can check 4 5 6 for me please?

Answer 4

sure

Answer 5

4 and 5 is correct

Answer 6

okay thx

Answer 7

@sasquat is number 6 right?

Answer 8

@Photon336

Answer 9

@Photon336 can u help me check it?

Answer 10

% composition of oxygen in magnesium bicarbonate.

first.

find the molar mass of magnesium bicarbonate

Mg(HCO3)2 = 146.34 grams/mol total mass

mass of oxygen, we see that we have 6 atoms of oxygen and the molar mass of oxygen is 16 g/mol right? so we multiply 6*16 = 96 grams of oxygen in our compound.

now

\[\frac{ mass of oxygen }{ total mass of magnesium bi carbonate } = \frac{ 96 }{ 146 }*100 = 66%\]


\[\frac{ molar mass of oxygen }{ molar mass of compound } x 100%\]

Answer 11

yeah i got 66 for 2

Answer 12

@ibrafacts essentially % composition means the % of a certain compound in your chemical formula. so you always need to find out the molar mass of the whole compound first

Answer 13

and 54g for 3