Answer:
36.8 g/mol of O
Explanation:
To find the number of grams, multiply the number of moles by the atomic mass of the element.
Oxygen has an atomic mass of 16.00.
2.3 moles O × (16.00 g O ÷ 1 mole) = 36.8 g/mol O
Hope that helps.
Answer:
No. of moles = given mass of compound / Molar mass
Explanation:
Given mass = 10g
Molar mass = (40 + 12 + 3x16) =100g/mol
No of moles of CaCO3 = 10 / 100 =0.1 mol
According to Avogadro’s law –
1 mol of CaCO3 molecules contains 6.022 x 1023 CaCO3 molecules
Hence, 0.1 mol of CaCO3 molecules will contain 6.022 x 1023x 0.1 molecules
i.e. 0.6022 x 1023 or 6.022 x 1022 molecules
This is all I can give