Which chemical equation is unbalanced?
OC+02 → CO2
o Sr + O2 → 25ro
O 6H2 + 302 → 6H20
O H2 + H2 + O2 → H2O + H2O

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

What is the mass of 0.46 mol of mgcl2