The balanced equation for the above reaction is as follows;
3NaOH + H₃PO₄ ---> Na₃PO₄ + 3H₂O
stoichiometry of NaOH to H₃PO₄ is 3:1
the number of NaOH moles in the solution - molarity x volume
number of NaOH moles - 0.3 mol/L x 0.030 L = 0.009 mol
for complete neutralisation
3 mol of NaOH requires 1 mol of H₃PO₄
therefore 0.009 mol of NaOH requires - 1/3 x 0.009 = 0.003 mol of H₃PO₄
therefore 0.003 mol of H₃PO₄ are needed to reach the equivalence point
Answer:2. 109 g NaCl
3. 31.9 g ZnCl2
4. 15.4 g Al2O3
Explanation: First find moles of the given compound
Next do the mole ratio between both compounds
Convert moles to mass.
Answer:
Silver
Explanation:
Silver has the highest thermal conductivity of any element and the highest light reflectance.
ΔG° = 14.1 kJ/mol
For the reaction A → B, <em>K</em> = [B]/[A].
If [A] = 240 and [B] = 1, then
<em>K</em> = 1/240 = 4.167 x 10^(-3)
The relationship between Δ<em>G</em>° and <em>K</em> is:
Δ<em>G</em>° = -<em>RT</em>ln<em>K</em>
where
<em>R</em> = the gas constant = 8.314 J·K^(-1)mol^(-1)
<em>T</em> = the Kelvin temperature
In this problem, <em>T</em> = (37 + 273.15) K = 310.15 K
∴ #Δ<em>G</em>° = -8.314 J·K^(-1)mol^(-1) × 310.15 K × ln(4.167× 10^(-3)
= -2579 × [-5.481 J·mol^(-1)] = 14 100 J·mol^(-1) = 14.1 kJ/mol
Note: We should expect Δ<em>G</em>° to be positive because <em>K</em> < 1.
