3. How many moles are in 75g of Na20?

1.2 moles

Explanation:

Given that,

Amount of moles of Na2O (n) = ?

Mass of Na2O in grams = 75g

For molar mass of Na2O, use the atomic masses:

Sodium, Na = 23g;

Oxygen, O = 16g

Na2O = (23g x 2) + 16g

= 46g + 16g

= 62g/mol

Since, amount of moles = mass in grams / molar mass

n = 75g / 62g/mol

n = 1.2 moles

Thus, there are 1.2 moles are in 75g of Na20

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

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