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Answer:
single replacement reaction is type of reaction is Au2S+H2---> 2Au+H2S.
There are 6 valence electrons in SO4^2
The mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g
We'll begin by calculating the partial pressure of N₂. This can be obtained as follow:
Total pressure = 784 torr
Partial pressure of H₂ = 124 torr
<h3>Partial pressure of N₂ =?</h3>
Total pressure = Partial pressure of H₂ + Partial pressure of N₂
784 = 124 + Partial pressure of N₂
Collect like terms
Partial pressure of N₂ = 784 – 124
<h3>Partial pressure of N₂ = 660 Torr</h3>
- Next, we shall determine the number of mole of N₂ in the mixture.
Pressure of N₂ (P) = 660 Torr
Volume (V) = 2 L
Temperature (T) = 298 K
Gas constant (R) = 62.364 L.Torr/Kmol
<h3>Number of mole of N₂ (n) =? </h3>
PV = nRT
660 × 2 = n × 62.364 × 298
1320 = n × 18584.472
Divide both side by 18584.472
n = 1320 / 18584.472
<h3>n = 0.071 mole</h3>
- Finally, we shall determine the mass of N₂ in the mixture.
Mole of N₂ = 0.071 mole
Molar mass of N₂ = 2 × 14 = 28 g/mol
<h3>Mass of N₂ =? </h3>
Mass = mole × molar mass
Mass of N₂ = 0.071 × 28
<h3>Mass of N₂ = 1.988 g</h3>
Therefore, the mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g
Learn more: brainly.com/question/20853110
KOH is an alkali metal hydroxide and so would be a strong base. HCl is a hydrogen halide in solution, which would be a strong acid (the exception would be HF). There are no other strong bases or acids in this list, so these two substances will comprise our bookends.
KNO3 is a salt produced during the neutralization reaction between KOH and HNO3; the former is (as we just noted) a strong base, and the latter is a strong acid. The salt consisting of the conjugate acid and base of a strong base and acid, respectively, produces a neutral solution in water. So, the KNO3 would be neutral.
KCN in solution consists of the ions K+ and CN-; K+, as we just went through, is the conjugate acid of KOH, a strong base. CN- is the conjugate base of HCN, a weak acid in solution. Since the resultant salt, KCN, is the neutralization product of a strong base and a weak acid, it will be slightly basic in solution (the CN- is a stronger base than K+ is as an acid). So, the KCN solution would be slightly basic.
NH4Cl dissociates in solution to give NH4+ and Cl-. NH4+, as the conjugate acid of the weak base ammonia, NH3, will donate an H+ in water. Cl- is the conjugate base of a strong acid, HCl. The neutralization product of a strong acid (HCl) and a weak base (NH3) would be slightly acidic. So, the solution of NH4Cl would be slightly acidic.
Ranking the solutions from most acidic to most basic (note: it’s important that the solutions have the same concentrations), we get:
HCl (strong acid)
NH4Cl (weak acid salt)
KNO3 (neutral salt)
KCN (weak basic salt)
KOH (strong base).