Determination of Number of Atoms by Mass
Q1: Calculate no. of atoms in 46g of Na.
Q4:
Q2: Calculate no of atoms in 98g of Ca.
Q5:
Q3: Calculate no. of atoms in 500g of Zn.
Q6:
Q7: Calculate the number of atoms in 9g of Al.
Q8: Calculate the mass of one atom of carbon in grams.
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Answer:
1. molar mass of Na 23
no of moles = 46/23 = 2
no of atoms = 2×6.023×10²³ = 12.046×10²³
2. molar mass of Ca = 40
no of moles = 98/40 = 2.45
no of atoms = 2.45× 6.023×10²³ = 14.75×10²³
3. molar mass of Zn = 65.38
no of moles = 500/65.38 = 7.64
no of atoms = 7.64×6.023×10²³ = 46.01×10²³
4. molar mass of Al =26.998
no of moles = 9/26.998 = 0.333
no of atoms = 0.333×6.023×10²³ = 2.005×10²³
5. molar mass 12 divided by 6.023×10²³ = 1.994×10²³g
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