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### Topic: chemistry problems: find molar mass  (Read 3192 times)

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#### amir01

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##### chemistry problems: find molar mass
« on: February 05, 2009, 10:55:07 PM »
can any help with these show me how to do them
find molar mass
K2Cr2O7

CaSO4

CuI2

H20

Al2(CO3)3
« Last Edit: February 06, 2009, 07:28:03 PM by geodome »

#### Astrokel

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##### Re: chemistry problems
« Reply #1 on: February 05, 2009, 10:59:27 PM »
Find each of the element in the periodic table and get its Ar. Note the subscript means how many atoms of that element. Sum all of them up to get the molar mass of the compound.

For example, Mr of CO2 = 12 + 2(16) = 44 g/mol
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#### amir01

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##### Re: chemistry problems
« Reply #2 on: February 05, 2009, 11:16:24 PM »
thnx for help but can show me how to these too

number of moles for each of the following compounds given the mass

45.9 g Ca(OH)2

356.2 g SiO2

#### Astrokel

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##### Re: chemistry problems
« Reply #3 on: February 05, 2009, 11:31:49 PM »
Have you learn stoichiometry? No formula in your note or text?
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