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3 years ago

How many grams of beryllium chloride will be consumed if 987.5 g of magnesium chloride is produced?

1 answer:

8 0

The number Beryllium chloride consumed is calculated as follows

write equation for reaction

that is BeCl2 + Mg -----> MgCl2 +Be

find the moles of MgCl2 produced

moles =mass/molar mass of MgCl2

= 987.5g/95 = 10.39 moles
by use of mole ratio between BeCl2 to Mgcl2 which 1:1 therefore the moles of BeCl2 is also 10.39moles

mass of BeCl2 = moles x molar mass

that is 10.39 x80 = 831.2

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which quantity will always have a negative value? A) the total bond energy of the reactants in an endothermic reaction. B) the c

Andre45 [30]

Considering the definition of enthalpy of a hemical reaction and endothermic and exothermic reaction, the correct answer is option C: the change in energy in a system during an exothermic reaction.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

On the other side, an endothermic reaction requires energy while an exothermic reaction releases energy.

In other words, a chemical reaction is endothermic when it absorbs energy from the environment. In this case, the heat is transferred from the outside to the inside of the system.

On the other hand, an exothermic reaction is one where energy flows out of the system. This energy is released in the form of heat.

So, if the enthalpy of reaction is negative, it means that during the course of the reaction, the system loses or releases heat to the environment and is exothermic, while if the enthalpy of reaction is positive, it means that during the course of the reaction, the system absorbs heat from the environment and is endothermic.

So, the correct answer is option C: the change in energy in a system during an exothermic reaction.

Learn more:

8 0

3 years ago

Read 2 more answers

A barium hydroxide solution is prepared by dissolving 2.81 g of Ba(OH)2 in water to make 25.6 mL of solution. What is the concen

chubhunter [2.5K]

The concentration of the solution in units of molarity is 0.64 M and the concentration of the solution in terms of g/mL is 0.10976 g/mL.

<h3>What is the concentration of the solution?</h3>

The measure of the amount of the solute dissolved in the given amount of the solvent or solution is said to be the concentration of the solution.

It is given by the expression,

Concentration of the solution = mass of the solute/total volume of the solution

Units: g/mL

<h3>What is the concentration of the solution in units of molarity?</h3>

The concentration of the solution in units of molarity is given by the expression,

Molarity = (no. of moles of the solute)/(Volume in L)

Units: moles/L

<h3>Calculation:</h3>

It is given that the solute is barium hydroxide - Ba(OH)₂

The mass of Ba(OH)₂ = 2.81 g

When in dissolved in water, the total volume of the solution = 25.6 mL

The molar mass of Ba(OH)₂ = 171.34 g/mol

Then,

No. of moles = (mass of Ba(OH)₂)/(molar mass of Ba(OH)₂)

i.e.,

No. of moles = $\frac{2.81}{171.34}$ = 0.0164 mole

Concentration = mass of the solute/total volume

I.e., C = $\frac{2.81}{25.6}$ = 0.10976 g/mL

Then the concentration of the solution in units of molarity is,

Molarity = (no. of moles)/(Volume of the solution in L)

⇒ Molarity = $\frac{0.0164}{25.6/1000}$ = 0.64 M

Therefore, the concentration of the solution in units of molarity is 0.64 M.

Learn more about molarity here:

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8 0

2 years ago

Differentiate between a precipitate and an aqueous solution

antiseptic1488 [7]

Answer:

A precipate is a solid while an aqueous solution is liquid.

Explanation:

A precipitate is a solid which separates after a chemical reaction occurs. It is the solid product of the reaction.

An aqueous solution is formed when a substance is dissolved in water.

6 0

4 years ago

How many carbon atoms are represented by the model below A) 0 B) 3 C) 2 D) 1

Bogdan [553]

Answer:

Option (B) 3.

Explanation:

In the model represented above, the two extreme represent carbon atoms since no other group are attached to it. The joint at the middle also represent carbon atom.

Thus, we can write a more simplify illustration for the model above as

C—C—C

From the above illustration, we can see that the model contains 3 carbon atom.

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3 years ago

Substance P is carbon.

stepan [7]

Explanation:

substance Q could be oxygen (O2)

substance R could be carbon dioxide (CO2)

4 0

3 years ago