1 answer

A research chemist isolates a new compound with an empirical formula C_3H_ O_2. Dissolving 2.51 g...

Question:

A research chemist isolates a new compound with an
A research chemist isolates a new compound with an empirical formula C_3H_ O_2. Dissolving 2.51 g of the compound in 100.0 g of water produces a solution with a freezing point of -0.325 degree C. What is the molecular formula of the compound? For water K_ = 1.86 degree C/m.

Answers

3.

Depresion of freezing point is expressed as

delta T = Kf x molality

molality = delta T / Kf

Here delta T = 0.325 oC

Kf = 1.86 oC/m

So, molality = delta T / Kf

                    = 0.325 oC / (1.86 oC/m)

                    = 0.1747 m

                    = 0.1747 moles/Kg

we have 2.51 g of our new compound in 100 g of water.

So, 25.1 g / 1000 g of water = 25.1 g/Kg of water.

Hence,

0.1747 moles = 25.1 g

1 mole = 25.1 / 0.1747 = 143.7 g

Empirical Formula = C3H3O2.

So, empirical mass = (3 x 12) + (3 x 1) + (2 x 16)

                               = 71g

Which indicates there are 2 empirical units per molecular formula.

Hence the molecular formula is 2(C3H3O2) = C6H6O4

.

Similar Solved Questions

1 answer
Do you remember your first day or orientation with an former (or current) employer? Describe the...
Do you remember your first day or orientation with an former (or current) employer? Describe the phases of socialization you went through. Be sure to define each phase and highlight communication by offering examples of some typical interactions you may have at each stage in the process (pp. 123 - 1...
1 answer
At x = 1 the function (in the graph below) is o continuous, differentiable o continuous,...
At x = 1 the function (in the graph below) is o continuous, differentiable o continuous, not differentiable o not continuous, not differentiable o not continuous, differentiable...
1 answer
The Atlantic Medical Clinic can purchase a new computer system that will save $11,000 annually in...
The Atlantic Medical Clinic can purchase a new computer system that will save $11,000 annually in billing costs. The computer system will last for nine years and have no salvage value. Click here to view Exhibit 128-1 and Exhibit 12B:2. to determine the appropriate discount factor(s) using tables. R...
1 answer
Beanie owns a gas pump that is honest. When the pump reads 24 gallons of gas,...
Beanie owns a gas pump that is honest. When the pump reads 24 gallons of gas, you might not get exactly 24 gallons because of random variation, but on average it delivers 24 gallons. The standard deviation is 0.3 gallons. The government is going to do a random check on Beanie's gas pump. They wi...
1 answer
Organic Chemistry Help Please A student performs the following steps to isolate biphenyl from a solid...
Organic Chemistry Help Please A student performs the following steps to isolate biphenyl from a solid 1:1 mixture of biphenyl and salicylic acid. Dissolve 2.0 grams of the mixture in 20 mL of ether Extract the ether layer 2-3 times with an aqueous solution of 5% sodium bicarbonate Add 2-3 spatula...
1 answer
Find the standard deviation. Round to two decimal places. 7. 110, 160, 243, 298
Find the standard deviation. Round to two decimal places. 7. 110, 160, 243, 298...
1 answer
Stillicum Corporation makes ultra light-weight backpacking tents. Data concerning the company's two product lines appear below:...
Stillicum Corporation makes ultra light-weight backpacking tents. Data concerning the company's two product lines appear below: Direct materials per unit Direct labor per unit Direct labor-hours per unit Estimated annual production Deluxe $ 67.00 $ 25.00 0.70 DLHS 10,000 units Standard $ 55.00 $...
1 answer
W21 Online teachir + akeAssignment/takeAssignment Main.do?invoker=&takeAssignmentSession Locator:&inprogress-false eBook Calculator Print Item Cost of Production Report Hana...
W21 Online teachir + akeAssignment/takeAssignment Main.do?invoker=&takeAssignmentSession Locator:&inprogress-false eBook Calculator Print Item Cost of Production Report Hana Coffee Company roasts and packs coffee beans. The process begins by placing coffee beans into the Roasting Department....
1 answer
Question 11, chap 123, sect 5. part 1 of 2 10 points Two charged particles of...
Question 11, chap 123, sect 5. part 1 of 2 10 points Two charged particles of equal magnitude (+Q and -Q) are fixed at opposite corners of square that lies in a plane (see figure below) A test charge -q is placed at a third corner. +Q et -9 What is the direction of the force on the test charge due t...
1 answer
Chapter 13: Homework 13.1: The Solution Process 1. (13.16 Brown) Indicate the principal type of solute-solvent...
Chapter 13: Homework 13.1: The Solution Process 1. (13.16 Brown) Indicate the principal type of solute-solvent interaction in each of the following solutions and rank the solutions from weakest to strongest interaction: KCI in water b. CH, Cl, in benzene (CH) c. Methanol (CH,OH) in water a. 2. (13.2...
1 answer
Brief Exercise 13-11 The following data are taken from the financial statements of Cullumber Company. 2017...
Brief Exercise 13-11 The following data are taken from the financial statements of Cullumber Company. 2017 2016 Accounts receiva ble (net), end of year $564,600 $564,500 Net sales on account 4,018,000 4,898,000 Terms for all sales are 1/10, n/45 Compute for each year the accounts receivable turnover...
1 answer
ACCOUNTING CYCLE Basic journal entry with the step-through method For the following transaction, answer the questions...
ACCOUNTING CYCLE Basic journal entry with the step-through method For the following transaction, answer the questions that follow in accordance with the rules of journalizing and the Transaction: Stewart Company placed an ad in the local paper for the current month to be paid next month, $1,600. whi...
1 answer
QUESTION 1 John's blood pressure is 134r96. What blood pressure classification does he belong in? O...
QUESTION 1 John's blood pressure is 134r96. What blood pressure classification does he belong in? O a. Pre-Hypertension O b. Stage 1 Hypertension O c Stage 2 Hypertension O d Hypertensive Crisis QUESTION 2 Denise has a blood pressure of 181/79. What blood pressure classification would she belong...
1 answer
When Fe(s) reacts with Ch() according to the following reaction, 400 J of energy are evolved...
When Fe(s) reacts with Ch() according to the following reaction, 400 J of energy are evolved for each mole of Fe(s) that reacts. Complete the following thermochemical equation 2Fe(s)+3Che)2FeCl3(3) AH= C H...
1 answer
A bike pedal is 45 cm from the axle How much torque does a 40 9...
A bike pedal is 45 cm from the axle How much torque does a 40 9 kg girl standing on the pedal exert when it is horizontal? 150 Nm 180 Nm 98 Nm 0 When the net torque acting on a system is zero which of the following is constant? Force Angular momentum Linear momentum None of the above...
1 answer
How do find the vertex and axis of symmetry, and intercepts for a quadratic equation #f(x)=x^2+12x+36#?
How do find the vertex and axis of symmetry, and intercepts for a quadratic equation #f(x)=x^2+12x+36#?...
1 answer
How many different proton signals would the following compound show in its 1H NMR spectrum? Me)...
How many different proton signals would the following compound show in its 1H NMR spectrum? Me) 13r OMe A. 1 B. 3 C. 5 D. 6...
1 answer
If elasticity of demand is 0.3, elasticity of supply is 0.3, and a 20% excise tax...
If elasticity of demand is 0.3, elasticity of supply is 0.3, and a 20% excise tax is levied on the good: All of the burden falls on consumers. The tax burden on suppliers and the tax burden on consumers will be equal. The tax burden on suppliers will be greater than the tax burden on consumers. The ...