7.8 g/cm3 because Mass/Volume=Density
If the volume increases, the density decreases. If the volume decreases, the density increases.
Hope this helps!
Answer:
Explanation:
4
N
a
+
O
2
→
2
N
a
2
O
.
By the stoichiometry of this reaction if 5 mol natrium react, then 2.5 mol
N
a
2
O
should result.
Explanation:
The molecular mass of natrium oxide is
61.98
g
⋅
m
o
l
−
1
. If
5
m
o
l
natrium react, then
5
2
m
o
l
×
61.98
g
⋅
m
o
l
−
1
=
154.95
g
natrium oxide should result.
So what have I done here? First, I had a balanced chemical equation (this is the important step; is it balanced?). Then I used the stoichiometry to get the molar quantity of product, and converted this molar quantity to mass. If this is not clear, I am willing to have another go.
Because oxygen is more electronegative<span> than hydrogen. The oxygen atom in h2o pulls electrons towards itself, resulting in a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms. oppositely charfed ends of</span>water molecules<span> are attracted to each other, forming a hydrogen bond</span>
