Answer:
-2.86x10³ kJ
Explanation:
The enthalpy of a reaction (ΔH) is defined as the heat produced or consumed by a reaction. In the reaction:
2 C₂H₆(g) + 7 O₂(g) → 4 CO₂(g) + 6 H₂O(g)
The ΔH is the heat envolved in the reaction per 2 moles of C₂H₆. 1.43x10³ kJ are involved when 1 mole reacts. Thus, when 2 moles react, involved heat is:
1.43x10³ kJ ₓ 2 = <em>2.86x10³ kJ</em>. As the reaction is a combustion reaction (Produce CO₂ and H₂O), the heat involved in the reaction is <em>PRODUCED, </em>that means ΔH is negative, <em>-2.86x10³ kJ</em>
PH scale is used to determine how acidic or basic a solution is.
we have been given the hydrogen ion concentration. Using this we can calculate pH,
pH = - log[H⁺]
pH = - log (1 x 10⁻¹ M)
pH = 1
using pH can calculate pOH
pH + pOH = 14
pOH = 14 - 1
pOH = 13
using pOH we can calculate the hydroxide ion concentration
pOH = - log [OH⁻]
[OH⁻] = antilog(-pOH)
[OH⁻] = 10⁻¹³ M
hydroxide ion concentration is 10⁻¹³ M
Answer:
I'm pretty sure the answer is ATP
Explanation:
Answer:
The temperature of the cold water is lower than the warm one. So, when we put the hand in the warm from the cold water, our hand will absorb heat, causing the hand to feel hot. Thus, we can conclude that the more heat it absorbs, the more hotter it is. Whereas the more heat it releases, the colder it is.
Using the equation we get something like this:
M = moles of solute/ liters of solution
But we need the number of moles of solute right? so we gotta arrange the equation to make it fit our needs.
M x liters of solution = moles of solute
M = mol/L
Liters of solution = L
moles of solute = mol
We have the M which stands for the molar mass in mol/L (0.4M)
And we also have the mL which are the liters of our solution, yet to be converted into liters. Let's divide them by a 1000 to make it into liters.
250mL / 1000 = 0.250L
Now we can multiply them! and find the number of moles of solute by replacing them, remember M can be changed into m/mol, because it's pretty much the same but written in another way.
0.4mol/L x 0.250L = 0.1 mol
The liters canceled, and we end up with mol. So, the answer is 0.1 mol.
