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3 years ago

Can someone help me with chemistry

Chemistry

1 answer:

Komok [63]3 years ago

3 0

Answer:

The resulting pH will be greater than 7 because potassium hydroxide is less concentrated than the hydrochloric acid.

Explanation:

hope this helped!

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Hello there please help this is for science and if you answer thanks for the help you earned yourself a 5 star.

weqwewe [10]

Answer:

Ice cubes, glass of tea, and butter

Explanation:

Like it said in the hint, the molecules will only speed up if they gain heat. This means in order for the object to heat up it will have to have a temperature that is less than the temperature in the room. Ice cubes, glass of tea, and butter are the three objects that have a temperature less than 72 degrees so when they are placed in the 72 degrees room they will heat gain heat (therefore making the molecules move faster)

8 0

3 years ago

Consider the malate dehydrogenase reaction from the citric acid cycle. Given the listed concentrations, calculate the free energ

Ahat [919]

<u>Answer:</u> The Gibbs free energy of the reaction is 21.32 kJ/mol

<u>Explanation:</u>

The chemical equation follows:

$\text{Malate }+NAD^+\rightleftharpoons \text{Oxaloacetate }+NADH$

The equation used to Gibbs free energy of the reaction follows:

$\Delta G=\Delta G^o+RT\ln K_{eq}$

where,

$\Delta G$ = free energy of the reaction

$\Delta G^o$ = standard Gibbs free energy = 29.7 kJ/mol = 29700 J/mol (Conversion factor: 1 kJ = 1000 J)

R = Gas constant = 8.314J/K mol

T = Temperature = $37^oC=[273+37]K=310K$

$K_{eq}$ = Ratio of concentration of products and reactants = $\frac{\text{[Oxaloacetate]}[NADH]}{\text{[Malate]}[NAD^+]}$

$\text{[Oxaloacetate]}=0.130mM$

$[NADH]=2.0\times 10^2mM$

$\text{[Malate]}=1.37mM$

$[NAD^+]=490mM$

Putting values in above expression, we get:

$\Delta G=29700J/mol+(8.314J/K.mol\times 310K\times \ln (\frac{0.130\times 2.0\times 10^2}{1.37\times 490}))\\\\\Delta G=21320.7J/mol=21.32kJ/mol$

Hence, the Gibbs free energy of the reaction is 21.32 kJ/mol

4 0

3 years ago

Which of the following pairs of compounds can you directly compare against each other theoretically? (choose all that apply) (hi

Allisa [31]

Answer:

Explanation:

7 0

4 years ago

*GIVING BRAINLIEST* NEED ANSWER ASAPPP

poizon [28]

Same Question here answered by me with explanation check the link below for your answer.

brainly.com/question/24944271?

8 0

3 years ago

A solution is to be prepared with a sodium ion concentrationof

Lina20 [59]

Answer : The mass of sodium sulfate needed is 5.7085 grams.

Explanation : Given,

Concentration of sodium ion = 0.148 mol/L

Volume of solution = 2.29 L

Molar mass of sodium sulfate = 142 g/mole

First we have to determine the moles of sodium ion.

$\text{Concentration of sodium ion}=\frac{\text{Moles of sodium ion}}{\text{Volume of solution}}$

$0.184mol/L=\frac{\text{Moles of sodium ion}}{2.29L}$

$\text{Moles of sodium ion}=0.08035mole$

Now we have to calculate the moles of sodium sulfate.

The balanced chemical reaction will be,

$Na_2SO_4\rightarrow 2Na^++SO_4^{2-}$

As, 2 moles of sodium ion produced from 1 moles of $Na_2SO_4$

So, 0.08035 moles of sodium ion produced from $\frac{0.08035}{2}=0.040175$ moles of $Na_2SO_4$

Now we have to calculate the mass of sodium sulfate.

$\text{Mass of }Na_2SO_4=\text{Moles of }Na_2SO_4\times \text{Molar mass of }Na_2SO_4$

$\text{Mass of }Na_2SO_4=0.040175mole\times 142g/mole=5.7085g$

Therefore, the mass of sodium sulfate needed is 5.7085 grams.

3 0

4 years ago