Hello
The balance chemical reaction is 2Al + 6HCl -à 2AlCl3 + 3H2 Assuming excess amount of HCl because it is not given Mole Al reacted = 13.5 g ( 1 mole/ 27 g) = 0.5 mole Al
Mole H2 = 0.5 mol Al ( 3 mole H2 / 2 mole Al) = 0.75 mole H2
since at STP then 1 mole gas occupies 22.414 L volume H2 = 0.75 mole (22.414 L / mol) = 16.8105 L H2
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You have not specified any indication of volume, but I will assume this is in a vessel of 1.00 L.
If 0.0100 mole of H+ is added to this buffer, then in the equilbrium
<span> NH3+H2O ⇄ NH4+ + OH-
the H+ reacts with OH- and decreases [OH-] and shifts the equilibrium to the products. [NH4+] will increase by 0.0100 M and [NH3] will decrease by 0.0100M. So the new concentrations are [NH4+] = 0.110 M and [NH3] = 0.09 M. Then
[OH-] = [NH3]/[NH4+] * Kb</span>
= 0.09/0.110 *1.8*10^-5
<span> = 1.47 x 10^-5
and pOH = -log(</span><span>1.47 x 10^-5) = 4.8318.
Since pH + pOH = 14,
pH = 14 - 4.8318 = 9.168
The answer to this question is therefore 9.168.</span>
They might change because of the flies color
Answer: Option C) 0.64kPa
Explanation:
Given that,
Original volume V1 = 11.2 L
original pressure P1 = 0.860kPa
New volume V2 = 15.0 L
New pressure P2 = ?
Since pressure and volume are involved while temperature is constant, apply Boyle's law
P1V1 = P2V2
0.860 kPa x 11.2 L = P2 x 15.0L
9.632 kPaL = P2 x 15.0L
P2 = 9.632 kPaL / 15.0L
P2 = 0.64 kPa
Thus, the pressure of the gas is 0.64kPa
Hi!
Here’s the answer
All soils contain mineral particles, organic matter, water and air. The combinations of these determine the soil's properties – its texture, structure, porosity, chemistry and colour.