Answer:
380
Explanation:
I couldn't find the answer anywhere so this is the correct answer. I got it graded.
Answer:
a. Oxygen
b. 20.39g of Al₂O₃
c. 87%
Explanation:
In order to produce 2moles of Al₂O₃, we need to make react 4 moles of Al, to 3 moles of O₂.
We determine the limiting reactant with the moles of each:
12.98g / 26.98g/mol = 0.481 moles of Al
9.6g / 32g/mol = 0.300 moles of oxygen
4 moles of Al react to 3 moles of O₂
Then, 0.481 mol may react to (0.481 . 3)/4 = 0.361 moles
We only have 0.300 moles of O₂ and we need 0.361. Oxygen is the limiting reactant.
So 3 moles of O₂ can produce 2 moles of Al₂O₃
Our 0.300 moles may produce (0.300 . 2) / 3 = 0.200 mol
Our theoretical yield is: 0.2 mol . 101.96g/ mol = 20.39 g
To determine the percent yield we calculate:
(Produced yield/ Thoeretical yield) . 100 → (17.74 /20.39) . 100 = 87%
after Paying attention to the clues ,
Small Rounded Pebbles
Deposited far from the ocean
The most likely environment in which it formed would be : Beach or Delta
hope this helps
The particles will move faster and further apart. There will be more energy in the particles due to the heat.
Answer:
The solution's new volume is 1.68 L
Explanation:
Dilution is the procedure to prepare a less concentrated solution from a more concentrated one, and simply consists of adding more solvent. So, in a dilution the amount of solute does not vary, but the volume of the solvent varies.
In summary, a dilution is a lower concentration solution than the original.
The way to do the calculations in a dilution is through the expression:
Ci*Vi=Cf*Vf
where C and V are concentration and volume, respectively; and the i and f subscripts indicate initial and final respectively.
In this case, being:
- Ci= 7 M
- Vi= 0.60 L
- Cf= 2.5 M
- Vf=?
Replacing:
7 M*0.60 L= 2.5 M* Vf
Solving:
Vf= 1.68 L
<u><em>The solution's new volume is 1.68 L</em></u>