Which best protects animal species that are endangered due to overhunting?

A 5.91 g unknown sample analyzed by elemental analysis revealed a composition of 37.51 % C. In addition, it was determined that

SSSSS [86.1K]

Answer:

C₆H₈O₇

Explanation:

1) Calculate the mass of carbon (C)

mass of C = % of C × mass of sample / 100

mass of C = 37.51% × 5.91 g / 100 = 2.21 g

2) Calculate the number of moles of C

number of moles = mass in grams / molar mass

number of moles of C = 2.21 g / 12.01 g/mol = 0.184 moles

3) Calculate the number of moles of hydrogen atoms, H:

number of moles = number of atoms / Avogadro's number

number of moles of H = 1.4830 × 10²³ / 6.022 × 10²³ = 0.24626 moles

4) Calculate the number of moles of oxygen atoms, O:

number of moles = number of atoms / Avogadro's number

number of moles of O = 1.2966 × 10²³ / 6.022 × 10²³ = 0.21531 moles

5) Find the mole ratios:

Summary of moles:

C: 0.184 mol

H: 0.24626 mol

O: 0.21531 mol

Divide every amount by the smallest number, which is 0.184:

C: 0.184 / 0.184 = 1

H: 0.24626 / 0.184 = 1.34

O: 0.21531 / 0.184 = 1.17

Multiply by 3 to round to integer numbers:

C: 1 × 3 = 3

H: 1.34 × 3 = 4.02 ≈ 4

O: 1.17 × 3 = 3.51

Multiply by 2 to round to integer numbers:

C: 3 × 2 = 6

H: 4 × 2 = 8

O: 3.51 × 2 ≈ 7

Use the mole ratios as superscripts to write the empirical formula

C₆H₈O₇ ← answer

Just as a reference, you can search in internet and find that one compound with that empirical formula is citric acid.

7 0

1 year ago

Which example best demonstrates stewardship of the atmosphere

Margarita [4]

Incomplete question. However, I provided a specific example of stewardship of the atmosphere.

Explanation:

First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.

An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.

3 0

2 years ago

Which of the reagents listed below would efficiently accomplish the transformation of ethyl-3-pentenoate into 3-penten-1-ol?

Mandarinka [93]

Reactions of Ethyl-3-pentenoate with all given reagents are given below.

Reaction with H₂ / Pd:
The non-polar double bond present in Ethyl-3-pentenoate is reduced to saturated chain. This reagent can not reduce the carbonyl group.

Reaction with NaBH₄:
Sodium Borohydride is a weak reducing agent at compared to LiAlH₄. It can only reduce aldehydes and Ketones to corresponding alcohols.

Reaction with LiAlH₄:
Lithium Aluminium hydride is a strong reducing agent. It can reduce all types of carbonyl compounds to corresponding alcohols, But, it can not reduce non-polar double bonds like alkenes and alkynes.

Result:
The correct answer is Option-A (Highlighted RED below).

7 0

2 years ago

In the Acid-Base Chemistry Experiment the measurement of pH will be used to explore acid-base concepts, analyze an unknown, and

aleksley [76]

Answer

a) A solution with a hydronium molarity of 0.00045 is acidic. True

Doing the calculus of pH

$pH= -Log [H^{+}] = -Log (0.00045)$

b) pH is a way to express the hydronium concentration over a wide range. True

pH means –Log[H+] and this value is used to express a wide range of hydronium concentration sometimes obtaining pH minor than zero.

c) Percent K and Fe are determined by doing ion exchange then a pH titration. False

Usually, Fe is determined by redox titration with potassium permanganate due to it’s more accurate. On the other hand, K is determined usually by volumetric process which includes precipitation like potassium picrate precipitate

d) About 0.2M HCl is the reagent used for the pH titrations. False.

In order to do pH titration, it is possible to use a wide range of HCl concentrations and other acids as reagent if the analyte is a basic compound. Otherwise, if the analyte is an acid compound you should use a basic compound as reagent.

e) A Lewis base is specie that can donate a proton to an acid. False

A Lewis base is an electron pair donor.

5 0

1 year ago

A flask contains 0.180 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask.

Reika [66]

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

0.180 mol Br2 ( 6.022 x 10^23 molecules / mole ) = 1.084x10^23 molecules Br2

5 0

1 year ago

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