Some pure calcium carbonate is made to react completely with 100cm3 Hydrochloric acid of unknown concentration. 120cm3 of carbon dioxide was formed at Room temperature. calculate the number of moles of carbon dioxide formed at room temperature

Explanation:

as we know that 1dm3 =1000cm3

therefore x dm3 =120 cm3

1000X =1*120

X dm3 =120/1000=0.12

so 120 cm3 =0.12 dm3

now the number of moles of carbon dioxide at RTP is

moles =given volume(dm3)/standard volume at RTP

moles=0.12dm3/24

moles =5*10^-3

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.