Which of the following is a balanced chemical equation?

SO2 + O2 + 2 H2O → 4 H2SO4

H2O2 → H2O + O2

2 Fe2O3 + 3 C → 4 Fe + 3 CO2

2 Mg + HC1 → MgCl2 + H2

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11