Question

5. How many molecules are present in one gram molecular mass of a substance ?
4. How many atoms are present in one gram atomic mass of a su
6. What name is given to the number 6.022 1023 ?
7. Convert 12 g of oxygen gas into moles.​

Answer 1

Answer:

1. That is, the molar mass of a substance is the mass (in grams per mole) of 6.022 × 10 23 atoms, molecules, or formula units of that substance.

2. 6.022 × 1023 (avogadro's number) atoms are present in one gram atomic mass of a substance.

3.The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.

4. 0.375 moles

Answer 2

Explanation:

1)That is, the molar mass of a substance is the mass (in grams per mole) of 6.022 × 10 23 atoms

4)6.022 × 1023 (avogadro's number) atoms are present in one gram atomic mass of a substance.

6)avogadro's number

7)Molecular weight of oxygen in grams = 32 g of oxygen= one mole of oxygen gas

Thus, 12 g of oxygen=

32

1

×12=0.375 moles