Chemistry, 20.09.2019 23:30 lilly9240

An organic liquid is a mixture of methyl alcohol (ch3oh) and ethyl alcohol (c2h5oh). a 0.220-g sample of the liquid is burned in an excess of o2(g) and yields 0.386 g co2(g) (carbon dioxide). set up two algebraic equations, one expressing the mass of carbon dioxide produced in terms of each reagent and the other expressing the mass of sample burned in terms of each reagent. what is the mass of methyl alcohol (ch3oh) in the sample?

Answers: 1

Show answers

Answers

Answer from: cameronking019

the mass of methyl alcohol (CH3OH) in the sample is 0.0641 g

Explanation:

1. Preliminars;

Mass of CH₃ OH: MMass of C₂H₅OH: EMolar mass of CH₃ OH: 32.04 g/molMolar mass of C₂H₅OH: 46.07 g/molMolar mass of CO₂: 44.01 g/molMolar mass equation: molar mass = mass in grams / number of moles

2. Algebraic equation # 1: mass of sample burned in terms of each reagent.

M + E = 0.220 (1)

3. Algebraic equation # 2: mass of carbon dioxide produced in terms of each reagent.

a) Combustion of methyl alcohol

2CH₃OH(l) + 3O₂(g) → 2CO₂(g) + 4H₂O(g) 2 mol CH₃OH → 2 mol CO₂2 × 32.04 g CH₃OH → 2 × 44.01 g CO₂Mass of CO₂ produced from M grams of CH₃OH = M / 32.04 × 44.01 = 1.374 M

b) Combustion of ethyl alcohol

C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(g) 1 mol C₂H₅OH → 2 mol CO₂46.07 g CH₃OH → 2 × 44.01 g CO₂Mass of CO₂ produced from E grams of C₂H₅OH = E / 46.07 × 88.02 = 1.911 E

c) Mass of CO₂ (g) obtained, in terms of each reagent

1.374 M + 1.911 E = 0.386 (2)

4) System of equations

M + E = 0.220 (1) 1.374 M + 1.911 E = 0.386 (2)

5) Solution

From equation (1): E = 0.220 - MSubstituting in equation (2): 1.374 M + 1.911 (0.220 - M) = 0.3861.374 M + 0.4204 - 1.911 M = 0.386- 0.537 M = - 0.0344M = 0.0344 / 0.537 = 0.0641 g

the mass of methyl alcohol (CH3OH) in the sample is 0.0641 g

Answer from: Quest

they both have a y in them

Answer from: Quest

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

Another question on Chemistry

Chemistry, 21.06.2019 20:30

Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presión. ¿cual será el volumen del gas a condiciones normales? sí el gas es oxígeno, ¿cuál será su peso? y ¿cuántas moléculas están presentes en el sistema?

Answers: 2

Answer

Chemistry, 22.06.2019 04:30

This question is about electrolysis. metal spoons can be coated with silver. this is called electroplating. suggest one reason why spoons are electroplated?

Answers: 1

Answer

Chemistry, 22.06.2019 10:30

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Answers: 1

Answer

Chemistry, 22.06.2019 13:50

How does the motion of particles in a gas change as the gas cools

Answers: 2

Answer

You know the right answer?

An organic liquid is a mixture of methyl alcohol (ch3oh) and ethyl alcohol (c2h5oh). a 0.220-g sampl...

Questions