Homework Answers
2. 1 mole of any substance is equal to 6.02 × 1023 atoms.
Moles =
given mass of the substance ÷ atomic mass
atomic mass of Zn = 65.38 g/mol
moles of Zn = 15.4 g ÷ 65.38 g/mol
= 0.2355 mol
ans is D.
3. Molar mass = given mass ÷ moles
= 6.66 ÷ 0.274
= 24.31 g/mol
4. Moles of carbon = given mass ÷ atomic mass
= 41.20 ÷ 12.011
= 3.43 mol
5.Mass of helium (in grams)
= moles × Atomic mass
= 2.34 × 4.0026
= 9.37 grams
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