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lbvjy [14]
3 years ago
14

A 20.3 mass % aqueous solution of iron(III) chloride has a density of 1.280 g/mL. Calculate the molality of the solution. Give y

our answer to 2 decimal places.
Chemistry
1 answer:
V125BC [204]3 years ago
8 0

Answer:

Molality for the solution is 1.57 m

Explanation:

Molality is mol of solute in 1kg of solvent.

20.3 % by mass means that 20.3 g of solute (FeCl₃) are contained in 100 g of solution..

Let's determine the mass of solvent.

Mass of solution = Mass of solvent + Mass of solute

100 g = Mass of solvent + 20.3 g

100 g - 20.3 g = Mass of solvent → 79.7 g

Let's convert the mass in g to kg

79.7 g . 1kg / 1000 g = 0.0797 kg

Let's determine the moles of solute (mass / molar mass)

20.3 g / 162.2 g/mol = 0.125 mol

Molality = 0.125 mol / 0.0797 kg → 1.57 m

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<h3>Further explanation</h3>

Given

The reaction for the production of CO₂

Required

The highest atom economy

Solution

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the higher the atomic economy value of a reaction, the smaller the waste/ byproducts produced, so that less energy is wasted

The general formula:

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<em>or </em>

Atom economy = (total formula masses of useful product : total formula masses of all reactants/products) x 100

So a reaction that only produces one product will have the highest atomic value, namely the reaction in option C

4 0
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Shalnov [3]

Answer:

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Explanation:

A dynamic equilibrium is like a cycle, the reactants change to products, but the products also change to reactants keeping the amount of each constant.

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In this statement there isnt a equilibrium. The products will change to reactants until the reaction stops.

3. A state of balance in which the forward reaction continues but reverse reaction stops.

Here the reactants will change to products until the reaction stops.

4. A state of balance in which the forward and reverse reactions stop.

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Several interrelated physical properties determine the characteristics of magma, including chemical composition, viscosity, dissolved gases, and temperature.Magma also form igneous rock.

Therefore the magma is heated and becomes less dense by the core moving it toward the crust.

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