Chemistry, 15.07.2019 23:30 lsrgb

How could you show experimentally that the molecular formula of propene is c3h6, not ch2?

Answers: 1

Show answers

Answers

Answer from: emalvidrez5205

By performing experiments related with the elevation in boiling point and depression in freezing point.

Explanation:

Hello,

In this case, we use the concept of colligative properties of solutions because they depend on the concentration of solute molecules or ions rather than its identity. They are classified as vapor pressure lowering, boiling point elevation, freezing point depression and osmotic pressure.

Elevation in boiling point and depression in freezing point are suitable for us to determine the molecular formula of propane as shown below:

- Elevation in Boiling Point: by performing an elevation in boiling point experiment, it is possible to quantify ebuilloscopic constant for the solvent, in order words, the molal (referred to molality) boiling point elevation constant of propane, using it as a solute. Then, one applies the formula:

$\Delta T_b=i*Kb*m_{solute}$

To compute the molality and subsequently propane's molecular mass.

- Depression in freezing point: by performing this one, it is possible to determine the molecular mass of the propane. Thus, we find the molal freezing point depression constant of the solvent to subsequently apply the shown below formula:

$\Delta T_f=i*Kf*m_{solute}$

Which is suitable to compute the molality as well as in the previous case.

Best regards.

Answer from: Quest

No table found. the question asks for covalent bond based on electronegativies

Answer from: Quest

$\frac{239}{94}pu+\frac{1}{0}n ====> \frac{y}{z}x+\frac{134}{54}xe+3\frac{1}{0}$

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137 subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54 subtract 54 from both sides.

40 = z

answer

$\frac{103}{40}x=\frac{103}{40}zr$

Another question on Chemistry

Chemistry, 22.06.2019 01:00

Which of the following is not a true statement about dwarf planets? a the kuiper belt contains comets, asteroids, and dwarf planets. b ceres is a dwarf planet located in the kuiper belt. c the largest known dwarf planet in the solar system is named eris.

Answers: 2

Answer

Chemistry, 22.06.2019 02:40

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

Answers: 3

Answer

Chemistry, 22.06.2019 03:40

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Answers: 3

Answer

Chemistry, 22.06.2019 08:30

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size