Answer is 355 grams.
Explanation:
Given the molecular weights:
M
r
N
a
O
H
=
40
g
m
o
l
M
r
N
a
2
S
O
4
=
142
g
m
o
l
The analogy of the moles will be held constant:
n
N
a
O
H
n
N
a
2
S
O
4
=
2
1
n
N
a
O
H
n
N
a
2
S
O
4
=
2
For each one, substitute:
n
=
m
M
r
Therefore:
n
N
a
O
H
n
N
a
2
S
O
4
=
2
m
N
a
O
H
M
r
N
a
O
H
m
N
a
2
S
O
4
M
r
N
a
2
S
O
4
=
2
200
40
x
142
=
2
200
⋅
142
40
x
=
2
200
⋅
142
=
2
⋅
40
x
x
=
200
⋅
142
2
⋅
40
=
100
⋅
142
40
=
10
⋅
142
4
=
1420
4
=
=
710
2
=
355
g
r
a
m
s
(or just use a calculator)
The lone pairs on the oxygen in the following compound are best described as: <u>one localized and one delocalized</u>
<h3>Lone pair electron</h3>
A lone pair electron is valence shell electron pair associated with one atom, and not part of a covalent bond.
Within the context of this question, the oxygen atom of water for instance has two lone pair of which one of them is localized and other one is delocalized
Learn more about lone pair electrons:
brainly.com/question/3915115
Answer:
9.4g
Explanation:
Given parameters:
Volume of hydrogen gas at STP = 15L
Unknown:
Mass of solid lithium = ?
Solution:
The reaction equation is shown below;
2Li + 2H₂O → 2LiOH + H₂
To solve this problem, lets work from the known to the unknown. The known here is hydrogen gas;
At STP;
number of moles = = = 0.67mole
From the balanced reaction equation;
1 mole of hydrogen gas is produced from 2 moles of Li;
0.67 moles of hydrogen will be produced from 0.67 x 2 = 1.34moles
Mass of solid lithium = number of moles x molar mass
= 1.34 x 7
=9.4g
12HClO4 + P4O10 = 6Cl2O7 + 4H3PO4
Answer:
Ok so I assume they gave u a reaction before asking this question. Look at that reaction and try to figure out what substances are changing in valency, if there is a substance(s) that doesn't change its valency then it's a spectator ion.