Atoms..?
1) number of moles for 3.01 times 10 to the power of 24
2)number of atoms of formula units in 7.5 moles of potassium bromide (KBr)
Answer:
1) Divide by Avogadro's number, which is 6.02×10^23, to get 5.00 moles.
2) This isn't really clear; do you want the number of atoms or the number of formula units? There are 7.5 × 6.02×10^23 = 4.5×10^24 formula units, and twice as many (9.0×10^24) atoms.
(Note: One formula unit consists of one atom each of K and Br, so there are two atoms per formula unit. If it was something like CaCO3, there would be five atoms per formula unit.)
one mole of each substance contains its 6.022*10(23) particles. 3.01*10(24)/6.022*10(23)= X will be the number of moles and 7.5*6.022*10(23)*2= atoms in 7.5 moles of KBr.
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