Answer:

2.) 6.02 × 1023 atoms

Since 1 mol Na = 6.02 × 1023 atoms Na, the two unit factors are 1 mol Na/6.02 × 1023 atoms Na, and its reciprocal 6.02 × 1023 atoms Na/1 mol Na.

3.) 23 water molecules

A mole (mol) is the amount of a substance that contains 6.02 × 10 23 representative particles of that substance. The mole is the SI unit for amount of a substance. Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 23 water molecules in a mole of water molecules.

4.)two holes

Sodium chloride is NaCl. It is made up of sodium ions (Na+) and chloride ions (Cl-). 1 mole of sodium chloride contains 1 mole Na+ and 1 mole Cl-, so there are TWO moles of ions for every 1 mole of NaCl.

5.)twelve atoms

The value of the mole is equal to the number of atoms in exactly 12 grams of pure carbon-12. 12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 1023).

6.)6.02 × 10 23 representative particles.

One mole of carbon dioxide molecules has a mass of 44.01 g, while one mole of sodium sulfide formula units has a mass of 78.04 g. The molar masses are 44.01 g/mol and 78.04 g/mol respectively. In both cases, that is the mass of 6.02 × 10 23 representative particles.

Explanation:

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