Answer:
Step-by-step explanation:
solution 2 steps
first, step Molar mass
second step No. of moles formula
To calculate the number of moles in 6.80x10^22 formula units of Ba(NO3)2,
we need to first determine the molar mass of Ba(NO3)2.
Ba(NO3)2 contains one barium ion (Ba2+) and two nitrate ions (NO3-), so we can calculate the molar mass as:
Molar mass of Ba(NO3)2 = atomic mass of Ba + 2 x atomic mass of N + 6 x atomic mass of O
= 137.33 g/mol + 2 x 14.01 g/mol + 6 x 16.00 g/mol
= 261.34 g/mol
Now we can use Avogadro's number (6.022 x 10^23) to convert the given number of formula units into moles:
Number of moles = Number of formula units / Avogadro's number
Number of moles = 6.80 x 10^22 / 6.022 x 10^23 = 0.113 mol
Therefore, there are 0.113 moles in 6.80x10^22 formula units of Ba(NO3)2