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Answers
Answer:
1. 35Cl = 0.7577 and Molar mass = 34.9689
37Cl = 0.2423 and Molar mass = 36.9659
∴ Average Atomic mass = (0.7577x34.9689)amu + (0.2423x36.9659)
= 26.4959 + 8.9568 = 35.4527
2. The mass of a single atom of Carbon 12 is simply the mass of a mole of the stuff (12 grams) divided by Avogadro's number (6.022 x ). That works out to 1.9927 grams.
3. (i) a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
(ii) The mole is the unit of measurement for amount of substance in the International System of Units.
4. Avogadro's Constant = 6.02214086 × 10^23 mol^-1
The symbol is NA.
5. (i) molar mass of h20= 1*2+16
=> 2+16=18amu
(ii) The molecular mass of carbon dioxide, CO2
= (1 × Atomic mass of carbon) + (2 × Atomic mass of oxygen)
= [1(12.011 u) + 2 (16.00 u)]
= 12.011 u + 32.00 u
= 44.01 u