Domanda del libro di testo
(a) Ibuprofen is a common over-the-counter analgesic with the formula C13H18O2. How many moles of C13H18O2 are in a 500-mg tablet of ibuprofen? Assume the tablet is composed entirely of ibuprofen.
2. Atoms & Elements
Mole Concept
Scelta multipla
How many molecules are there in 560g of silicon dioxide (SiO2)?
A
1.20 x 10^24 molecules
B
9.32 x 10^24 molecules
C
3.01 x 10^23 molecules
D
6.02 x 10^23 molecules
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Determine the molar mass of silicon dioxide (SiO2) by adding the atomic masses of silicon (Si) and oxygen (O). The atomic mass of Si is approximately 28.09 g/mol and that of O is approximately 16.00 g/mol. Therefore, the molar mass of SiO2 is calculated as: g/mol.
Calculate the number of moles of SiO2 in 560 g by using the formula: moles.
Use Avogadro's number, which is molecules/mol, to convert the moles of SiO2 to molecules. Multiply the number of moles obtained in the previous step by Avogadro's number.
Set up the equation to find the number of molecules: .
Perform the multiplication to find the total number of molecules in 560 g of SiO2.
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