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3 years ago

What is the chemical equation of photosynthesis

2 answers:

8 0

A simple word equation is carbon dioxide + water —> glucose + oxygen + water
A balanced chemical equation for the process can be 6CO2 + 6H2O —> C6H12O6 + 6O2. Overall, photosynthesis uses light energy to convert carbon dioxide into a carbohydrate.
Hope this helps!

Zinaida [17]3 years ago

4 0

carbon dioxide + electron donor + light energy ==> carbohydrate + oxidized electron donor + water

CO2 + 2H2A + photons ==> [CH2O] + 2A + H2O

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A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.100 moles

alexgriva [62]

Answer : The pH of the solution is, 3.41

Explanation :

First we have to calculate the moles of $HF$ .

$\text{Moles of HF}=\text{Concentration of HF}\times \text{Volume of solution}$

$\text{Moles of HF}=0.250M\times 1.50L=0.375mol$

Now we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (6.8\times 10^{-4})$

$pK_a=4-\log (6.8)$

$pK_a=3.17$

The reaction will be:

$HF+OH^-\rightleftharpoons F^-+H_2O$

Initial moles 0.375 0.100 0.375

At eqm. (0.375-0.100) 0 (0.375+0.100)

= 0.275 = 0.475

Now we have to calculate the pH of solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[F^-]}{[HF]}$

Now put all the given values in this expression, we get:

$pH=3.17+\log [\frac{(\frac{0.475}{1.50})}{(\frac{0.275}{1.50})}]$

$pH=3.41$

Thus, the pH of the solution is, 3.41

8 0

3 years ago

Ethanol undergoes combustion in oxygen to produce carbon dioxide gas and liquid water. The standard heat of combustion of ethano

Mama L [17]

Answer:

$-277.6\ \text{kJ/mol}$

Explanation:

Heat of combustion of $C_2H_5OH(l)$ = -1366.8 kJ/mol

Heat of formation of $CO_2(g)$ = -393.5 kJ/mol

Heat of formation of $H_2O(l)$ = -285.8 kJ/mol

The reaction is

$C_2H_5OH(l)\rightarrow 2CO_2(g)+3H_2O(l)$

Assuming $x$ is the standard enthalpy of formation of ethanol

$-1366.8=2\times (-393.5)+3\times (-285.8)-x\\\Rightarrow x=2\times (-393.5)+3\times (-285.8)+1366.8\\\Rightarrow x=-277.6\ \text{kJ/mol}$

The standard enthalpy of formation of ethanol is $-277.6\ \text{kJ/mol}$ .

5 0

3 years ago

Use the drop-down menus to classify each of these substances,

raketka [301]

Answer:

Perfume = Ester
Fuel = Alcohol
Anesthetic = Ether
Weak base = Amine
Weak acid = Carboxylic acid

Explanation:

Substance abuse is related to misuse of toxic or hazardous substances for example alcohol, and illicit drugs. It leads to the psychoactive substances responsible for substance syndrome.

It is active due to global impairment in cognition, behavioral, and physiological phenomena that are developed after the repeated use of the substances abuse that is related to the strong desire to use the drugs.

5 0

2 years ago

Read 2 more answers

An unknown substance has a mass of 19.1 g. the temperature of the substance increases by 13.9 degrees celsius when 62.4 j of hea

sweet-ann [11.9K]

Heat=mass* change in temperature * specific heat
specific heat= 62.4/(.0191*13.9)
=235.037 J/kgK

8 0

3 years ago

A metal ball of mass 100 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 2.5 kJ. Another metal ball

Harrizon [31]

Answer:

A. The balls are made of the same material