23. What is the total number of moles of atoms in a mixture of 20.0 g of H2O2, 1.20 x 1024 molecules of SiO2, and 3.70 mol of I2?


How many moles is 30.0 cm3 of copper? The density of copper is 8.92 g/cm3.

20.0 g H2O2
covert it into moles and then moles of H and moles of O
convert moles of H to numbers of H by using avogadro's number.
please post one question in one post