The mass of 1.63 10 silicon atoms as 2.71 1023 g 4.58 1023 g 28.08 g 1.04 10 g 7
ID: 888867 • Letter: T
Question
The mass of 1.63 10 silicon atoms as 2.71 1023 g 4.58 1023 g 28.08 g 1.04 10 g 7.60 102 g How many silicon atoms are there in 1.00 g of silicon? 1 atom 0.0356 atoms 2.57 1023 atoms 2.14 1023 atoms 1.75 1023 atoms the molecular formula of aspirin is ? ? ? How many aspirin molecules are present in one 500-milligram tablet? 2.77 molecules 2.77 103 molecules 1.67 10 molecules 1.67 10 molecules How many are present in 25 6g of 0.393 6 3.95 1022 3.90 1022 2.37 1023 the empirical formula of a component U2F U F UF UF UFExplanation / Answer
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1) Molar mass of Silicon atom = 28.08 gms
Mass of 1.63 * 10^(23) atoms = 28.08 * 1.63 * 10^(23)/6.023 * 10^(23)
=> 7.60 gms
2) Number of Silicon atoms in 28.08 gms = 6.023 * 10^(23)
hence number of atoms in 1 gm = 6.023 * 10^(23)/28.08 = 2.144 * 10^(22) atoms
3) Molar mass of Aspirin
=> 9 * 12 + 8 * 1 + 4 * 16
=> 180 gm/mol
Number of atoms in 500 mg = 0.5/180 * 6.023 * 10^(23)
=> 1.67 * 10^(21) molecules
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