Can someone help me with any of these. Please!?

Question

i DON'T want the answers, if anyone knows how to start me off with some hints or steps, PLEASE share.

Thank you

Calculate the number of moles in:

A 2.3 # of carbon

A 5 Oz silver bracelet

A pound of table salt

A 350 kg cast iron engine block

A gal. of water (8.3 #)

A ton of sand (SiO2)

A 6.2 grams of blue vitriol

A pound of Epsom salts ?

Answer 1

use the atomic mass of that element..

example-Mg (Magnesium), the atomic mass is 24.3g/mol

look at the units, g/mol===> mass/ moles

you are going to have to convert all the wt into grams!!!!

if you have 24.3 grams of Mg, you then have 1 mole of Mg.

if you have 48.6 grams of Mg, you then have 2 moles....

hope that helps

Answer 2

Its nice to finally see someone who just wants help, not the answer.  This is merely a test of unit conversion, and how well you can google things.  You will need the molecular weight of the substance in order to calculate the moles.  You can find the formula for say, salt or blue vitriol, on a search engine and add it up yourself, or just search "mw of SiO2" (for the sand).  You will be given a number in g/mol.  Convert the amount of stuff you have into grams (onlineconversions.com or a similiar site works well).  Finally divide the amount of stuff you have by the molecular weight, and you will have the mols.

Good luck!