E 17

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Snigdha Uppu 1G
Posts: 49
Joined: Sat Sep 07, 2019 12:15 am

E 17

Postby Snigdha Uppu 1G » Sun Oct 06, 2019 11:44 pm

Which sample in each of the following pairs contains the
greater number of moles of atoms? (a) 75 g of indium or 80 g of
tellurium; (b) 15.0 g of P or 15.0 g of S; (c) 7.36 3 10 27 atoms of
Ru or 7.36 3 10 27 atoms of Fe.

Tanmay Singhal 1H
Posts: 143
Joined: Sat Jul 20, 2019 12:16 am

Re: E 17

Postby Tanmay Singhal 1H » Sun Oct 06, 2019 11:46 pm

A) 75 g of indium
B) 15 g of P
C) same number of moles

Snigdha Uppu 1G
Posts: 49
Joined: Sat Sep 07, 2019 12:15 am

Re: E 17

Postby Snigdha Uppu 1G » Sun Oct 06, 2019 11:47 pm

Thank you for answering my question

connie 2C
Posts: 106
Joined: Thu Jul 11, 2019 12:17 am

Re: E 17

Postby connie 2C » Thu Oct 10, 2019 3:04 pm

for part a and b, you would use the molar mass of the element to calculate the number of moles in each sample of the element. for part c, you would use avogadro's number to calculate the amount of moles in amount given.

Cynthia Rodas 4H
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: E 17

Postby Cynthia Rodas 4H » Sun Oct 13, 2019 4:55 pm

Parts (a) and (b) use the equation m= n * M.
m- mass of the sample
n- amount in moles
M- molar mass

Part (c) uses the equation n = N/NA
n- amount in moles
N- number of objects
NA- Avogadro's constant


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