Answer: Option C) 4 moles
Explanation:
The reaction below shows the decomposition of 2 moles of water to yeild 2 moles of hydrogen and 1 mole of oxygen respectively.
2H2O(l) --> 2H2(g) + O2 (g)
So, if 2 moles of H2O produce 1 mole of O2
8 moles of H2O will produce Z mole of O2
To get the value of Z, cross multiply
2 x Z = 1 x 8
2Z = 8
Z = 8/2
Z = 4
Thus, 4 moles of O2 is produced from the complete decomposition of 8 moles H2O .
Answer:
ΔH of CH4(g)+2O2(g)→CO2(g)+2H2O(l) is -899 KJ
Explanation:
step 1: write down thye reaction and rearrange them in a way that similar contents cancel out to produce the required reaction and add the enthalpy change of each.
CH4(g)+O2(g)→CH2O(g)+H2O(g) ΔH = -284 KJ
CH2O(g)+O2(g)→CO2(g)+H2O(g) ΔH = -527 KJ
2H2O(g)→2H2O(l) ΔH = 44 KJ x -2
the minus is because the last reaction has been reversed and multiplied by 2 so that the gaseous state H2O cancels with the others to leave liquid H2O in the required final reaction.
ΔHrxn = (-284)+(-527)+[44 x (-2)] = -899 KJ
Answer: 1.mass i think thats all know
Explanation:
sorry
Answer:
pH=3.38
Explanation:
We are given the concentrations of the weak acid and its conjugate base so we need to use the henderson hasslebalch equation
pH=pKa + log (concentration A-/concentration of HA)
A- : conjugate base NaC3H5O3
HA: weak acid HC3H5O3
so if we plug in what we are given
pH= 3.08 + log (1M/.5M)
pH= 3.38