How many atoms are there in 2.43 g of mercury?

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

Which of the following units is not an official si unit

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?