If the atoms that share electrons have an unequal attraction for the electrons, the bond is called

What is the pH of a weak base solution that has an [OH–] of 2.1 g 10–6 M? (4 points) APEX

Amiraneli [1.4K]

Answer:

8.3

Explanation:

1) Data:

a) [OH⁻] = 2.1 × 10⁻⁶ M . . . (the symbol g shown in the question is a typo)

b) pH = ?

2) Formulae:

pH + pOH = 14

pOH = log 1 /[OH⁻]

3) Solution:

pOH = log ( 1 / 2.1 × 10⁻⁶ ) = 5.7

pH = 14 - pOH = 14 - 5.7 = 8.3

5 0

3 years ago

Describe, using scientific terms, how plants turn sunlight into energy? make sure to refer to the chemical equation to photosynt

Sergio039 [100]

A plant is a living organism that uses chlorophyll in the chloroplasts to perform photosynthesis. The chemical equation of photosynthesis is
Sunlight(Photons)+ CO2+2H2O ----->C6H12O6+H2O+O2.(Not balanced) The reactants are carbon dioxide and water. The products are water and glucose with oxygen as a waste product.Photosynthesis can make a plant form a closed cycle as plants need to respire with oxygen which is a waste product of one of their reactions.

5 0

4 years ago

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A 25.00 mL sample of of a sulfurous acid solution is completely neutralized using 17.12 mL of 0.13 M sodium hydroxide. What is t

Kryger [21]

Answer:

0.0445 M is the initial concentration of sulfurous acid.

Explanation:

$H_2SO_3+2NaOH\rightarrow Na_2SO_3+2H_2O$

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_3$

are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\\M_1=?\\V_1=25.00mL\\n_2=1\\M_2=0.13 M\\V_2=17.12 mL$

Putting values in above equation, we get:

$2\times M_1\times 25.00 mL=1\times 0.13 M\times 17.12 mL$

$x=\frac{1\times 0.13 M\times 17.12 mL}{2\times 25.00}=0.0445 M$

0.0445 M is the initial concentration of sulfurous acid.

8 0

3 years ago

Consider the fermentation reaction of glucose: C6H12O6 → 2C2H5OH + 2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with 10

inessss [21]

Answer:

% yield = 73.48 %

Explanation:

The fermentation reaction is:

C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

The percent yield of C₂H₅OH is given by:

$\% yield = \frac{m_{E}}{m_{T}} * 100$

where $m_{E}$ : is the obtained mass of C₂H₅OH = 67.7g and $m_{T}$ : is the theoretical mass of C₂H₅OH.

The theoretical mass of C₂H₅OH is calculated knowing that 1 mol of C₆H₁₂O₆ produces 2 moles of C₂H₅OH:

$m_{T} = mol * M$

where M: is the molar mass of C₂H₅OH = 46.068 g/mol

$m_{T} = 2 moles * 46.068 g/mol = 92.136 g$

Hence, the percent yield of C₂H₅OH is:

$\% yield = \frac{67.7 g}{92.136 g}*100 = 73.48 \%$

I hope it helps you!

3 0

3 years ago

How does gravity affect the rain during a rainstorm?

Advocard [28]

Gravity is the force of attraction between two objects, and Earth's gravity pulls matter downward, toward its center. It pulls precipitation down from clouds and pulls water downhill. Gravity also moves air and ocean water. ... Gravity pulls denser air and water downward, forcing less dense air and water to move upward.

8 0

3 years ago

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