Textbook Question
(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
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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
Verified step by step guidance1
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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