Si O2 = 28.09 + 32 = 60.09 grams/mol
15 / 60.09 = 0.2496 mols
0.2496 mols * 6.022*10^23 molecules/mol = 1.5032 *10^23 molecules
Use the table of molar masses to answer the question
Element: | Molar mass (g/mol):
Silicon 28.09
Oxygen 16.00
How many molecules of silicon dioxide (SiO₂) are there in a 15-gram sample?
A. 6.022 x 10^23
B. 1.503 x 10^23
C. 2.049 x 10^23
D. 1.251 x 10^23
1 answer