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3 years ago

Which of the following changes will always be true for a system with increasing entropy? –ΔG –ΔH +ΔG +ΔS

Chemistry

1 answer:

Kruka [31]3 years ago

3 0

Answer: The correct answer is $+\Delta S$

Explanation:

From the given options:

$\Delta G$ represents the change in Gibb's Free energy of the reaction. If this value is negative, the reaction is said to be spontaneous and if the value is positive, the reaction is said to be non-spontaneous.

$\Delta H$ represents the change in enthalpy of the reaction. If this comes out to be negative, then the reaction is said to be exothermic and if it comes out to be positive, then the reaction is said to be endothermic.

$\Delta S$ represents the change in entropy of the reaction. If this comes out to be positive, then it means there is increase in entropy and if this comes out to be negative, then it means there is decrease in entropy.

Hence, the correct answer is $+\Delta S$

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When 1.98 g of NaOH (molar mass= 40 g/mole) are added to 75.0 mL of a 0.350 M HCl solution in a coffee-cup calorimeter, the temp

Wittaler [7]

Answer:

(ΔHrxn) = 1.273kJ/mol

Explanation:

Applying

m=78.2, c= 3.97, ∆t= 25.8-21.7

(ΔHrxn)= mc∆t

=78.2× 3.97× 4.1= 1.273kJ/mol

3 0

3 years ago

A 0.870 g sample of a monoprotic acid is dissolved in water and titrated with 0.300 M KOH.

Vedmedyk [2.9K]

Answer: The molar mass of monoprotic acid is 126.1 g/mol

Explanation:

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Molarity of KOH solution = 0.300 M

Volume of solution = 23.00 mL

Putting values in above equation, we get:

$0.300M=\frac{\text{Moles of KOH}\times 1000}{23.00}\\\\\text{Moles of KOH}=\frac{0.300\times 23.00}{1000}=0.0069moles$

The chemical equation for the reaction of monoprotic acid and KOH follows:

$HA+KOH\rightarrow KA+H_2O$

By Stoichiometry of the reaction:

1 mole of KOH reacts with 1 mole of HA

So, 0.0069 moles of KOH will react with = $\frac{1}{1}\times 0.0069=0.0069$ moles of HA

To calculate the molar mass for given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of HA = 0.870 g

Moles of monoprotic acid = 0.0069 mol

Putting values in above equation, we get:

$0.0069mol=\frac{0.870g}{\text{Molar mass of monoprotic acid}}\\\\\text{Molar mass of monoprotic acid}=\frac{0.870g}{0.0069mol}=126.1g/mol$

Hence, the molar mass of monoprotic acid is 126.1 g/mol

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3 years ago

What are some interesting facts about earths inner core?

liraira [26]

1. It is made out of Iron. 2. It's the hottest layer of the Earth, like super super hot.

3 0

3 years ago

Read 2 more answers

Rate law equation The rate of a chemical reaction depends on the concentrations of the reactants. For the general reaction betwe

shusha [124]

Answer: The reaction order with respect to A is m

Explanation:

Order of the reaction is defined as the sum of the concentration of terms on which the rate of the reaction actually depends. It is the sum of the exponents of the molar concentration in the rate law expression.

Elementary reactions are defined as the reactions for which the order of the reaction is same as its molecularity and order with respect to each reactant is equal to its stoichiometric coefficient as represented in the balanced chemical reaction.

For the given reaction:

$aA+bB\rightleftharpoons cC+dD$

$Rate=k[A]^m[B]^n$

In this equation, the order with respect to each reactant is not equal to its stoichiometric coefficient which is represented in the balanced chemical reaction.

Hence, this is not considered as an elementary reaction.

Order with respect to A = m

Order with respect to B = n

Overall order = m+n

Thus order with respect to A is m.

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3 years ago

Can someone help me please

andriy [413]

Cytosine and guanine is correct.

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3 years ago