myabean365 myabean365

02-04-2018
Chemistry

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How many molecules are in 25g of Na2SO4? POINTS!! Please help! Im so frustrated.

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Willchemistry Willchemistry

02-04-2018

Hey there!

Molar mass Na2SO4 = 142.04 g/mol

Number of moles:

n = m / mm

n = 25 / 142.04

n = 0.176 moles of Na2SO4

Therefore, use the Avogadro constant

1 mole Na2SO4 ------------------- 6.02x10²³ molecules
0.176 moles Na2SO4 ------------ molecules ??

0.176 x ( 6.02x10²³ ) / 1

=> 1.059x10²³ molecules of Na2SO4

hope this helps!

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