1.59moles
Explanation:
Mass of CaO = 89.23g
Unknown
Number of moles = ?
Solution:
The mole is a unit of measurement in chemistry used to delineate the number of particles an atom contains.
A mole of a substance contains the avogadro's number of particles.
Number of moles =
Molar mass of CaO = 40 + 16 = 56g/mol
Number of moles = = 1.59moles
learn more:
Number of moles brainly.com/question/1841136
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The answer is: [A]: "groups 3a through 8a" .
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(but not including "helium").
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When you rub a balloon on your head, electrons move from the atoms and molecules in your hair onto the balloon. Electrons have a negative charge, so the balloon becomes negatively charged, and your hair is left with a positive charge.