Calculate the volume of carbon (IV) oxide evolved at s. t.p(standard temperature and pressure) when 21g of sodium hydrogen trioxocarbonate (IV) is heated. [H=1,C=12, Na=23, O=16, molar volume(Vm)=22.4dm cube per mol]

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

; lc

What are the activitys?   sorry if this took your points : (

Ithink that one is (c)