Question E3 in the textbook

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NatBrown1I
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Joined: Fri Sep 28, 2018 12:17 am

Question E3 in the textbook

Postby NatBrown1I » Wed Oct 03, 2018 11:06 pm

How come you would only need 3 more atoms of At to balance with the 9 atoms of gallium? Wouldn't you need 3x as many atoms?

LorenzoDuvergne3I
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Joined: Fri Sep 28, 2018 12:25 am

Re: Question E3 in the textbook

Postby LorenzoDuvergne3I » Wed Oct 03, 2018 11:14 pm

You may have the molar masses of both elements confused with one another. Gallium's is 70 g/mol and astatine's is 210. Because astatine is three times as heavy as gallium, we only need one astatine atom per gallium atom. The scale has 9 gallium atoms, so we need a third as many astatine atoms. 9*(1/3) = 3, and so we only need 3 astatine atoms. Hope that cleared things up.

Nikki Bych 1I
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Joined: Fri Sep 28, 2018 12:16 am

Re: Question E3 in the textbook

Postby Nikki Bych 1I » Wed Oct 03, 2018 11:16 pm

Since the molar mass of gallium is 1/3 the amount of the molar mass of astatine, you need 1/3 gallium atoms for the masses to be equal (1/3 of 210 = 70).


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