3.- ¿El alqueno más sencillo con dos átomos de carbono y cuatro hidrógenos es el propeno? \( \begin{array}{ll}\text { A.-( ) VERDADERA } & \text { B.-( )FALSA }\end{array} \)

Determine the amount of moles in 12.15 g Mg .

Given 3.50 mole of Cu what is the mass of Cu in grams?

2. If a compound contains \( 40 \% \) sulfur and \( 60 \% \) oxygen by mass, what is the empirical formula of the compound? (Atomic masses: \( S=32 \mathrm{~g} / \mathrm{mol}, 0 \) \( =16 \mathrm{~g} / \mathrm{mol} \) )

10. What is the percentage composition of oxygen in \( \mathrm{H}_{2} \mathrm{O} \) ? (Molar mass of \( \mathrm{H}_{2} \mathrm{O}=18 \mathrm{~g} / \mathrm{mol} ; \mathrm{O}=16 \mathrm{~g} / \mathrm{mol} \) )

Determine the mass in grams of 2.00 mol N