How many atoms in total are there in 7.35 mol of magnesium oxide (MgO) molecules?

Chemistry

1 answer:

andreev551 [17]2 years ago

3 0

Answer:

4.42 x 10^24

Explanation:

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Part a the disproportionation of mn2+(aq) to mn(s) and mno2(s) in acid solution at 25 ∘c. calculate δg∘rxn.

ollegr [7]

Answer:

Δ $G^{o}$ = -461198.3 J

Explanation:

Gibbs free energy is defined as the energy associated with a given chemical reaction which can be used to do work. Firstly, we need to figure out the chemical equation for the given problem. For the given problem, the chemical equation is:

$Mn^{2+} _{(aq)} + 2e^{-}$ ⇒ $Mn_{(s)}$ $E^{o} = -1.18 V$

$Mn^{2+} _{(aq)} + H_{2}O$ ⇒ $MnO_{2(s)} +4H^{+} + 2e^{-}$ $E^{o} = -1.21 V$

The addition of the two $E^{o}$ gives the $E_{cell}$ of the equation, i.e. -1.18-1.21 = -2.39 V.

Then, using the equation for Δ $G^{o}$ , we have:

Δ $G^{o}$ = n*F* $E^{o}$ = 2*96485*-2.39 = -461198.3 J

4 0

3 years ago

An endothermic dissolution process a. absorbs energy as heat and has positive enthalpy of solution. b. releases energy as heat a

Whitepunk [10]

Answer:

a. absorbs energy as heat and has positive enthalpy of solution.

Explanation:

A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.

Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.

8 0

2 years ago

The part in the middle with a coil of wire wrapped around a metal shaft is part of an electric motor. What is it?

evablogger [386]

Answer:

rotor

Explanation:

The part of the motor being pointed to is called the <em>rotor</em>.