# Chemistry Avogadro's constant / moles

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#1
I am really struggling with these calculations. Could someone please explain with step by step workings. Thanks
True or False:
a) There are 1.2045 x 10^24 potassium ions in 100g of potassium hydrogencarbonate
b) There are 15 moles of chloride ions in a mixture of 3 moles of magnesium chloride and 3 moles of iron (III) chloride
c) 9.11g of osmium contain the same number of atoms as there in 3.6g of phosphorus molecules (P4)
Last edited by Kenz8473202; 3 months ago
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3 months ago
#2
It easy to find the formula and molar mass of these compounds on line. That weight = 6 x 10^23 molecules of the compound and that amount times the number of individual atoms in the compound which you get from the formula. It’s then just some simple and dull calculations to work our the true or false in each case
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#3
(Original post by Zarek)
It easy to find the formula and molar mass of these compounds on line. That weight = 6 x 10^23 molecules of the compound and that amount times the number of individual atoms in the compound which you get from the formula. It’s then just some simple and dull calculations to work our the true or false in each case
Thank you!
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