So in order to answer this we need the number of moles of oxygen and the right stoichiometry.
The balanced reaction should be 2HgO --> 2Hg + O2, therefore 2 moles of mercury are produced for every one mole of oxygen gas. Since we have the mass of O2 we can calculate the moles as moles = mass/RMM where RMM is the relative molecular mass of O2, which is 32 g/mol. Therefore the number of moles = 125/16 = 3.9 mol.
Since 2 moles of Hg are produced for every one mole of O2, the number of moles of Hg = 3.9*2 = 7.8 mol.
Answer:
Magnesium (Mg)
Explanation:
An element with a lower atomic mass than Calcium that has similar chemical property is the element Magnesium (Mg).
This because, elements in the same group or family on the periodic table has similar chemical properties.
Magnesium belongs to the same group as Calcium, other elements are:
Be Mg Ca Sr Ba Ra
The group is made of the alkaline earth metals. They have two valence electrons in their outer shell.
2 and 4 both start with hydro
Avogadro’s number (6.022x10^23) is the number of atoms in a mole of any substance.
8.800x10^25 / 6.022x10^23 = 146.13 mols in tin
Mass = moles x Ar(Sn) = 146.13 x 50 = 7306.5g
You can apply this to the other question.
2.575x10^24 / 6.022x10^23 = 4.276
Mass = moles x Mr(H20) = 4.276 x 18 = 76.968g
Hope this helps.
Answer:
Group 1. Alkali Metals
Explanation:
credit: Difference Between First and Second Ionization Energy
