Help pls! this is for chemistry tmr is my last day in trying to get this in

130.76g of Zn are needed

Explanation:

Zinc, Zn, reacts with silver nitrate, AgNO3, as follows:

Zn + 2AgNO3 → Zn(NO3)2 + 2Ag

Where 1 mole of Zn reacts with 2 moles of AgNO3

For a complete reaction of 4 moles of AgNO3 are needed:

4mol AgNO3 * (1mol Zn / 2mol AgNO3) = 2mol Zn

The mass of Zn is (Molar mass: 65.38g/mol):

2mol Zn * (65.38g / mol) =

that tool would be a compass

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!

if you need further assistance, let me know: )

~ trueboss72