Answer:
Average atomic mass = 6.96 amu.
Explanation:
Abundance of Li-6 = 4%
Abundance of Li-7 = 96%
Atomic mass of Li-6 = 6 amu
Atomic mass of Li-7 = 7 amu
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (4×6)+(96×7) /100
Average atomic mass = 24 + 672 / 100
Average atomic mass = 696 / 100
Average atomic mass = 6.96 amu.
Answer:
Unbalanced
Explanation:
The reaction equation is given as:
H₂ + O₂ → 2H₂O
The given reaction flouts the law of conservation of mass and it is not balanced. To know a reaction that is balanced, the number of atoms on both sides of the expression must be the same;
Number of moles
Reactants Products
Hydrogen 2 4
Oxygen 2 2
We see that the hydrogen atoms are not balanced.
You can use any form of the Ideal Gas Law, but usually one form is more convenient, depending on the information given.
There are three forms of the Ideal Gas Law.
Form 1
P
V
=
n
R
T
If the question gives you the number of moles then
, this is the most convenient one to use.
Form 2
P
V
=
m
M
R
T
, where m is the mass of the gas and
M is its molar mass.
If the question gives you the mass
m
, this is the most convenient one to use.
Form 3
P =
ρ
M
R
T
, where ρ is the density of the gas.
If the question gives you the density
ρ
, this is the most convenient one to use.
