How many oxygen atoms in CO2 ?

How many oxygen atoms in 3CO2 ?

How many atoms in 4NaCl ?

How many molecules in 12 HOH ?

How many hydrogen atoms in 12 HOH ?

How many elements in NaClHNOPS ?

How many sodium atoms in 5NaClS ?

How many atoms in 14NaCl ?

Which is NOT a compound?

How many total atoms are in 4 H2SO4 ?

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