Answer:
<h2>938.54 moles </h2>
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
We have the final answer as
<h3>938.54 moles</h3>
Hope this helps you
Answer:
ΔHr = -275 kj
Explanation:
It is possible to obtain the net change in enthalpy for the formation of one mole of lead(II) sulfate from lead, lead(IV) oxide, and sulfuric acid using the reactions:
(1) H₂SO₄(l) → SO₃(g) + H₂O (l) ΔH=+113kJ
(2) Pb(s) + PbO₂(s) + 2SO₃(g) → 2PbSO₄(s) ΔH=−775kJ
If you sum (1) + ¹/₂(2) you will obtain:
H₂SO₄(l) + ¹/₂Pb(s) + ¹/₂PbO₂(s) → PbSO₄(s) + H₂O(l)
Using Hess's law, the net change in enthalpy for this reaction could be obtained as:
ΔHr = ΔH(1) + ¹/₂ΔH(2)
ΔHr = +113kJ + ¹/₂ -775kJ
ΔHr = -275 kJ
Answer:
The most common isotope is Bromine-79.
Explanation:
Answer:
The new pressure is 8.58 atm
Explanation:
Using Boyle's law which states that the pressure of a gas is inversely proportional to the volume of the gas and mathematically written as;
P1 V1 = P2 V2
P1 = 3.7atm
V1 = 5.8L
V2 = 2.5L
P2 = ?
Equate the values to the equation and solve for P2:
P2 = P1 V1 / V2
P2 = 3.7 * 5.8 / 2.5
P2 = 21.46 / 2.5
P2 = 8.584 atm
The new pressure acting on the balloon is therefore 8.58atm