How many grams are in 1.30 x 10^24 formula units of Ca(NO3)2? A. 151 g
B. 354 g
C. 294 g
D. 416 g

354 gram

Explanation:

No of formula units = no of moles × Avogadro's number

Number of moles = no of formula units/ Avogadro's number

No of moles = 1.30×10^24/60.02×10^23

No of moles = 2.159 moles

Mo of moles = mass in gram/ molar mass

Mass in gram = no of moles× molar mass

Mass in gram =2.159×164

Mass in gram = 354.15 gram

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answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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