Chemistry, 11.07.2019 19:00 zoeybuch5

The molar mass of the common antibiotic oxytetracycline is found to be 460 g mol-1 and a 2.000 g sample contains 1.1478 g of carbon, 0.10435 g of h, 0.62609 g of oxygen and the remainder being nitrogen. what is the molecular formula of the oxytetracycline

Answers: 1

Show answers

Answers

Answer from: Raymond123

C₂₂H₂₄O₉N₂

Solution:

Step 1: Calculate %age of Elements;

%C = 1.1478 / 2 × 100 = 57.39%

%H = 0.104035 / 2 × 100 = 5.20%

%O = 0.62609 / 2.00 × 100 = 31.30%

%N = 100% -(57.39 + 5.20 + 31.30) = 6.11%

Step 2: Calculate Mass of Elements as;

C = (57.39 / 100 ) × 460 = 263.99 g

H = (5.20 / 100 ) × 460 = 23.92 g

O = (31.30 / 100 ) × 460 = 143.98 g

N = (6.11 / 100 ) × 460 = 28.10 g

Step 3: Calculate Moles of Elements:

C = 263.99 / 12 = 21.99 mol

H = 23.92 / 1 = 23.92 mol

O = 143.98 / 16 = 8.99 mol

N = 28.10 / 14 = 2.00 mol

Step 4: Calculate the simplest mole ratio as;

C H O N

21.99/2 : 23.92/2 : 8.99/2 : 2/2

10.99 11.96 4.49 1

≈ 11 ≈ 12 ≈ 4.5 1

Multiply by 2 to get the whole number for oxygen

22 24 9 2

Empirical Formula = C₂₂H₂₄O₉N₂

It is also the molecular formula because the mass of empirical formula is equal to molecular mass as,

= (12)₂₂ + (1)₂₄ + (16)₉ + (14)₂

= 264 + 24 + 144 + 28

= 460

Answer from: Quest

how to make a simple air condition

Answer from: Quest

It will fall off and tip over.

Another question on Chemistry

Chemistry, 21.06.2019 19:00

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

Answers: 1

Answer

Chemistry, 22.06.2019 05:00

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

Answers: 2

Answer

Chemistry, 22.06.2019 05:30

What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?

Answers: 1

Answer

Chemistry, 22.06.2019 05:30

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

Answers: 1

Answer

You know the right answer?

The molar mass of the common antibiotic oxytetracycline is found to be 460 g mol-1 and a 2.000 g sam...

Questions