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4 years ago

Which of the following is an example of a conversion from electrical energy to sound energy? microphone radio generator windmill

Chemistry

2 answers:

arlik [135]4 years ago

5 0

Answer:

the answer is A I DID THIS QUESTION

Explanation:

9966 [12]4 years ago

3 0

Speakers converts electrical energy into sound energy. So I think it would be radio. Hope this helps

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BRAINLIEST FOR CORRECT ANSWER

Nat2105 [25]

Answer:

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Explanation:

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3 years ago

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72.0 grams of water how many miles of sodium with react with it?

Flura [38]

Answer:

$\large \boxed{\text{8.00 mol}}$

Explanation:

We will need a balanced chemical equation with masses, moles, and molar masses.

1. Gather all the information in one place:

Mᵣ: 18.02

2Na + H₂O ⟶ 2NaOH + H₂

m/g: 72.0

2. Moles of H₂O

$\text{Moles of H$_{2}$O} = \text{72.0 g H$_{2}$O} \times \dfrac{\text{1 mol H$_{2}$O}}{\text{18.02 g H$_{2}$O}} = \text{3.996 mol H$_{2}$O}$

3. Moles of Na

The molar ratio is 2 mol Na/1 mol H₂O.

$\text{Moles of Na} = \text{3.996 mol H$_{2}$O} \times \dfrac{\text{2 mol Na}}{\text{1 mol H$_{2}$O}} = \textbf{8.00 mol Na}\\\\\text{The water will react with $\large \boxed{\textbf{ 8.00 mol}}$ of Na}$

7 0

3 years ago

For a particular isomer of C8H18, the combustion reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standa

mart [117]

Answer: The standard enthalpy of formation of this isomer of $C_8H_{18}(g)$ is -210.9 kJ

Explanation:

The given balanced chemical reaction is,

$C_8H_{18}(g)+\frac{25}{2}O_2(g)\rightarrow 8CO_2(g)+9H_2O(g)$

First we have to calculate the enthalpy of formation of $C_8H_{18}$ .

$\Delta H^o=H_f_{product}-H_f_{reactant}$

$\Delta H^o=[n_{CO_2}\times \Delta H_f^0_{(CO_2)}+n_{H_2O}\times \Delta H_f^0_{(H_2O)}]-[n_{O_2}\times \Delta H_f^0_{(O_2)+n_{C_8H_{18}}\times \Delta H_f^0_{(C_8H_{18})}]$

where,

We are given:

$\Delta H^o_f_{(CO_2(g))}=-393.5kJ/mol\\\Delta H^o_f_{(H_2O(g))}=-241.8kJ/mol\\\Delta H^o_f_{(O_2(g)))}=0kJ/mol$

Putting values in above equation, we get:

$-511.3kJ/mol=[(8\times -393.5)+(9\times -241.8)]-[(\frac{25}{2}\times 0)+(1\times \Delta H_f^0_{(C_8H_{18})}$

$\Delta H_f^0_{(C_8H_{18})}=-210.9kJ$

7 0

4 years ago

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You have a solution which is 45.6% by mass isopropyl alcohol (MM = 60.11 g/mol) in water. The density of this solution is 0.905

ladessa [460]

The molality of the isopropyl alcohol in the solution is 13.95 m

<h3>Assumption</h3>

Let the mass of the solution be 100 g.
45.6% by mass isopropyl alcohol = 45.6 g
Mass of solvent = 100 – 45.6 = 54.4 g

<h3>Determination of the mole </h3>

Mass of isopropyl alcohol = 45.6 g
Molar mass of isopropyl alcohol = 60.11 g/mol

Mole of isopropyl alcohol =?

Mole = mass / molar mass

Mole of isopropyl alcohol = 45.6 / 60.11

Mole of isopropyl alcohol = 0.759 mole

<h3>How to determine molality </h3>

Mole of isopropyl alcohol = 0.759 mole
Mass of solvent = 54.4 g = 54.4 / 1000 = 0.0544 Kg

Molality =?

Molality = mole / mass of solvent

Molality = 0.759 / 0.0544

Molality = 13.95 m

Learn more about Molality:

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3 years ago

What is your favorite household chemical reaction

Oksana_A [137]

Answer:

I always enjoy a good meal, so I'd say baking is my favorite household chemical reaction.

Explanation:

You are creating an endothermic reaction whenever you bake as the sugars and other molecules are broken apart, fused, and rearranged to make a delicious cake!

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2 years ago

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