One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24Mg compared with 12C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g
<span>The best answer is C. Alfred Wegener was convinced that all continents were once an enormous, single landmass which is call Pangaea. But it was also believed that it began to break into pieces that moved away from one another over 150 million years ago.</span>
M(S)=1 g
m(O)=1.5 g
M(S)=32 g/mol
M(O)=16 g/mol
n(S)=m(S)/M(S)
n(O)=m(O)/M(O)
n(S)=1/32=0.03125 mol
n(O)=1.5/16=0.09375 mol
S : O = 0.03125 : 0.09375 = 1 : 3
SO₃ - is the empirical formula
You should know the implicit meaning of the prefixes of units of measurements. Let's take for example, the unit of meters. When you say kilometers, that would be 10³ of a meter. When you say megameters, that's 10¹⁰ of a meter. So, if a unit is 5.69×10¹⁰ meters, you can just express that into 5.69 megameters.