Answer:
From the diagram, the water is being boiled. This process vaporises the water in the vessel leaving salt crystals behind.
Since the water is needed in liquid form, the cold water at the top of the set-up
condenses the vapor so it can be used.
Answer: The final temperature is equal to
45 Celsius
Explanation:
Explanation:
We have the amount of energy gain
Q
=
m
⋅
c
⋅
Δ
T
=
m
c
Δ
t
where
c
=
4.184
J
/
g
.
C
is the specific heat of water,
m
is the mass of water
⇒
840
=
10
x
4.184
⋅
(
t
−
25
)
t
=
840
10
x
4.184
+
25
=
45
i.e.
45
∘
C
Then it is C hope it helps :)
Answer:
The correct answer is <em>D) Niels Bohr</em>
Explanation:
Bohr proposed a new atomic model, whereby he explains that electrons rotate around the nucleus at well-defined levels, describing circular orbits. Each orbit was called the energy level (it is called the main quantum number n, going from numbers 1 to 7). To make his model, Bohr studied the Hydrogen atom (it has a proton in its nucleus and an electron rotating around it).
We can determine the empirical formula by first converting each of the grams to moles. remember to do this, first, we need the molar mass of the molecules which can be calculated by adding the mass of the atoms from the periodic table.
molar mass of CO2= 44.0 g/mol
molar mass of H2O= 18.02 g/mol
now, lets determine the grams of each atom
Carbon: 23.98 g x (12.011 g / 44.01 g) = 6.54 g C
Hydrogen: 4.91 g x (2.0158 g / 18.02 g) = 0.55 g H
Oxygen: 10.0 - (6.54 + 0.55) = 2.91 g O
Now let's convert each mass to moles.
C: 6.54 g / 12.01 g / mol = 0.54 mol
H: 0.55 g / 1.01 g/mol = 0.54 mol
O: 2.91 g / 16.00 g/mol = 0.18 mol
now that we have the moles of each atom, we need to divide them by the smallest value to find the ration. If you do not get the whole number, you need to multiply until to get a whole number.
C: 0.54 mol / 0.18 mol = 3
H: 0.54 mol / 0.18 mol = 3
O: 0.18 mol / 0.18 mol = 1
empirical formula--> C₃H₃O
