Answer : 0.0392 grams of Zn metal would be required to completely reduced the vanadium.
Explanation :
Let us rewrite the given equations again.



On adding above equations, we get the following combined equation.

We have 12.1 mL of 0.033 M solution of VO₂⁺.
Let us find the moles of VO₂⁺ from this information.

From the combined equation, we can see that the mole ratio of VO₂⁺ to Zn is 2:3.
Let us use this as a conversion factor to find the moles of Zn.

Let us convert the moles of Zn to grams of Zn using molar mass of Zn.
Molar mass of Zn is 65.38 g/mol.

We need 0.0392 grams of Zn metal to completely reduce vanadium.
The correct option is B.
Phenophtalein is an indicator that is usually used in acid base titration experiments. Indicators are substances that undergo distinct, observable changes when the pH of their solutions change. Indicators exhibit changing of colors depending on the pH of the solution in which they are found. They are usually weak bases and acid which are capable of partial dissociation and formation of ions when dissolved in water. There are different types of indicator and phenophtalein is one of them. Phenophtalein is colorless in acidic solution and pink in basic solutions.
Answer:The weight of Patterson on the moon would be less.
Explanation: It would be less because the moon has more mass.
Answer:
The heating effect of the residential heat pump will be 7.2 KJ/Sec
Explanation:
The rate of heat produced (
)
Here, Coefficient of performance = 1.6
Here, Consume of electrical power =4.5
The rate of heat produced (
) = Coefficient of performance × Consume of electrical power
∴
= 1.6 × 4.5
= 7.2 KJ/SEC
∴ The heating effect of the residential heat pump will be 7.2 KJ/Sec