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3 years ago

3. 2.15 x 3.1 x 100 =

Chemistry

2 answers:

jasenka [17]3 years ago

7 0

The answer would be 666.5 :)

jeka943 years ago

3 0

Answer:

666.5

Explanation:

Multiply 2.15 and 3.1 to get 6.665.

6.665×100≈666.5

Multiply 6.665 and 100 to get 666.5.

666.5

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Calculate the number of pounds of CO2 released into the atmosphere when a 22.0 gallon tank of gasoline is burned in an automobil

IrinaK [193]

Answer:

391.28771 pounds of carbon-dioxide released into the atmosphere.

Explanation:

Density of the gasoline ,d= 0.692 g/mL

Volume of gasoline in an tanks,V = 22.0 gallons = 83,279.02 mL

Let mass of the gasolin be M

$d=\frac{M}{V}$

M = V × d = 83,279.02 mL × 0.692 g/mL=57,629.081 g

Assume that gasoline is primarily octane (given)

$2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O$

Mass of octane burnt in the tank = M = 57,629.081 g

Moles of octane = $\frac{57,629.081 g}{114.08 g/mol}=505.1637 mol$

According to reaction, 2 moles of octane gives 16 moles of carbon-dioxide.

Then 505.1637 mol of octane will give:

$\frac{16}{2}\times 505.1637 mol=4,041.3100 mol$ of carbon-dioxide

Mass of 4,041.3100 mol of carbon-dioxide:

4,041.3100 mol × 44.01 g/mol = 177,858.05 g

Mass of carbon-dioxide produced in pounds = 391.28771 pounds

391.28771 pounds of carbon-dioxide released into the atmosphe

4 0

4 years ago

Which of the following describes water's ability to dissolve substances?

kicyunya [14]

Water is polar and dissolves polar substances

7 0

3 years ago

We will abbreviate malonic acid CH2(CO2H)2, a diprotic acid, as H2A (pK1 = 2.847 and pK2 = 5.696). Find the pH in (a) 0.200 M H2

larisa [96]

Answer:

a. pH → 1.77

b. pH → 4.27

Explanation:

Malonic acid is a dyprotic acid. It releases two protons:

H₂A + H₂O → H₃O⁺ + HA⁻ Ka1

HA⁻ + H₂O → H₃O⁺ + A⁻² Ka2

Let's find the first pH:

We expose the mass balance:

Ca = [HA] + [HA⁻] + [A⁻²] = 0.2 M

We can not consider the [A⁻²] so → Ca = [HA] + [HA⁻] = 0.2M

As the acid is so concentrated, we can not consider the HA- so:

Ca = [HA] = 0.2 M

Charge balance → [H⁺] = [HA⁻] + [OH⁻]

H₂A + H₂O → H₃O⁺ + HA⁻ Ka1

Ka = H₃O⁺ . HA⁻ / H₂A

We need the HA⁻ value to put on the charge balance. We re order the Ka expression:

HA⁻ = Ka . H₂A / H₃O⁺ (notice that H₃O⁺ = H⁺)

We replace: H⁺¨ = Ka . H₂A / H⁺

(H⁺)² = Ka . Ca

H⁺ = √(Ka . Ca) We determine Ka from pKa → 10²'⁸⁴⁷ = 1.42×10⁻³

H⁺ = √(1.42×10⁻³ . 0.2) = 0.016866

- log [H⁺] = pH → - log 0.016866 = 1.77

b. NaHA is the salt from the weak acid, where the HA⁻ works as an amphoterous, this means that can be an acid or a base:

HA⁻ + H₂O ⇄ A⁻² + H₃O⁺ Ka₂

HA⁻ + H₂O ⇄ H₂A + OH⁻ Kb2

There is a formula than can predict the pH, so now we need to compare the Ka₂ and Kb₂ data.

Ka₂ = 10⁻⁵'⁶⁹⁶ = 2.01×10⁻⁶

Kb₂ = 1×10⁻¹⁴ / 1.42×10⁻³ = 7.04×10⁻¹²

So Ka₂ > Kb₂. In conclussion the pH will be acid.

[H⁺] = √(Ka1 . Ka2) → [H⁺] = √ 1.42×10⁻³ . 2.01×10⁻⁶ = 5.34×10⁻⁵

- log 5.34×10⁻⁵ = pH → 4.27

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3 years ago

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Answer:

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3 years ago

Renewable resources are those that can be synthesized by humans. True or False?

marshall27 [118]

False because they are resources that are created repeatedly by nature so it doesn't end. For example solar or wind energy.

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3 years ago