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What is a mole? List everything you know about the mole.
How many atoms are present in 3.8 moles of sodium hydroxide, NaOH?
Calculate the molar mass for Ca(OH)2.

Respuesta :

Eduard22sly

Answer:

1. A mole is the amount which contains as many elementary particles as there are atoms in 12 grams of carbon-12. It is also the unit used in measuring the amount of matter. A mole also refers to the Avogadro's number of particles present in any substance.

2. 1mole of NaOH contains 6.02x10^23 atoms.

Therefore, 3.8 moles of NaOH will contain = 3.8 x 6.02x10^23 = 2.288 x 10^24 atoms

3. Molar Mass of Ca(OH)2 = 40 + 2(16+1) = 40 2(17) = 40 + 34 = 74g/mol

Explanation:

mayeke
1) A mole is an amount of a substance which contains as many elementary particles as there are in exactly 12g of the carbon-12 isotope. It can be gotten by dividing the given mass of a substance by it molar mass and has a unit “mol”

2) NaOH... Na= 1 atom, O= 1 atom, H= 1 atom hence it has 3 atoms

3) RAM of Ca= 40, O= 16, H= 1
Ans= 40+[(16+1)*2]
Ans= 40+[(17)*2]
Ans= 40+34
Ans= 74g

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