Question

calculate the mass of 0.5 mole of oxygen​

Answer 1

mass of 0.5 mole = m = 0.5 x 32.

= 16 g.

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Answer 2

Answer:

(i)0.5 mole of oxygen gas. (ii) 3.011 x 1023 atoms of oxygen. (iii) 6.022 x 1024 molecules of oxygen. (Given atomic mass of 0 = 16u; No = 6.022 x 1023 per mole

That is, mass of one mole of a set molecules is gram molecular mass of that molecule. For example, molecular mass of a water molecule is 18 amu (2 amu for 2 hydrogen atoms, and 16 amu for one oxygen atom). So, mass of one mole of water would be 18 grams. Thus, mass of 0.5 moles of water would be 9 grams.

Explanation:

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