[juliekaye]

I am struggling with the mole theory to say the least. I have 3 questions left and keep getting them wreong. CAn anyone help?
HWat is the mass on grams of 0.0112 mol K2CO3?
How many grams are in 0.50 mol H2SO4?
How many moles arre in 74 g KCI
thanks!

[Astrokel]

Any formula you have learnt that is related to mole and gram?

[juliekaye]

I have been working on finding the molar mass of an element by lloking on the periodic table.  I am SO confused. It is taking me forever to figure out the 9 questions I had and these last 3 I am never getting right.

[Astrokel]

Don't feel confused, take it slowly and it will work out eventually.

Mass number(A_r) is the number on top of the element on the periodic table. Remember the subscript of the chemical formula means how many atoms of that element per molecule. So getting molar mass(M_r) of the compound you have to multiply the element mass number(A_r) by the subscript integer. Once you get the molar mass, just apply the formula to get the moles.

[Borek]

Julie, show us how you get your (incorrect) answers, we will be able to tell were you went wrong.