Answer:
It helps identify trends and group elements with similar properties.
Explanation:
Arranging the elements according to the atomic mass wouldn't help us have groups and periods with predictable properties that we can have when arranging it according to atomic number. Don't forget that isotopes have different masses.
Answer:
Try a grams calculator, Its pretty to nd one :D
Explanation:
Answer:
c)
Explanation:
don't understand properly but it is c) cause they go through gens
Answer:
17.9 Moles
Explanation:
In the one-kilogram iron weight there are 1.08·1025 atoms, which corresponds to the chemical amount of approximately 17.9 moles of atoms
To find the number of moles, determine the molar mass of iron. Then divide the given mass by its molar mass, or multiply the given mass by the reciprocal of the molar mass, which is more common.
As far as I know NONE.....
Explanation:
Sodium peroxide can be thermolyzed to give dioxygen gas...
N
a
2
O
2
(
s
)
+
Δ
→
N
a
2
O
(
s
)
+
1
2
O
2
(
g
)
↑
⏐
⏐
⏐
But with water, we simply get an acid base reaction....
N
a
2
O
2
(
s
)
+
2
H
2
O
(
l
)
→
2
N
a
O
H
(
a
q
)
+
H
2
O
2
(
a
q
)
...
