Answer:
There are 0.135moles of UO2 in 28 grams of UO2
Step-by-step explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 mole UO2, or 207.03grams.
This is the molar mass of UO2, calculated from the sum of the molar masses of uranium and oxygen.
That is, molar mass of UO2= molar mass of U + (molar mass of O)2
=238.03g/mol + (16g/mol)2
= 238.03g/mol + 32g/mol= 270.03g/mol
Molar mass of UO2= 270.03g/mol
This implies that 1 mole of UO2 has a mass of 207.03 grams
Number of moles of UO2 = mass of UO2/ molar mass of UO2
Mass of UO2= 28 grams
Number of moles of UO2= 28 g/ 207.03gmol-1
Number of moles =0.1352 moles of UO2
Therefore, there are 0.135 moles of UO2 in 28 grams of UO2.