Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Sent to:
  • Textbooks
  • Test Prep
  • Numerade for Schools
  • Bootcamps
  • Class
  • Ask Question
  • StudyParty
  • Earn Money
    Refer a friend. Get $50! Become an Educator
  • Log in

Problem

Consider this question: What is the molecular for…
View
preview
Numerade Logo

Get the answer to your homework problem.

Try Numerade free for 7 days

Christopher N.
Numerade Educator

Like

Report

Problem 1 Problem 2 Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10 Problem 11 Problem 12 Problem 13 Problem 14 Problem 15 Problem 16 Problem 17 Problem 18 Problem 19 Problem 20 Problem 21 Problem 22 Problem 23 Problem 24 Problem 25 Problem 26 Problem 27 Problem 28 Problem 29 Problem 30 Problem 31 Problem 32 Problem 33 Problem 34 Problem 35 Problem 36 Problem 37 Problem 38 Problem 39 Problem 40 Problem 41 Problem 42 Problem 43 Problem 44 Problem 45 Problem 46 Problem 47 Problem 48 Problem 49 Problem 50 Problem 51 Problem 52 Problem 53 Problem 54 Problem 55 Problem 56 Problem 57 Problem 58 Problem 59 Problem 60 Problem 61 Problem 62 Problem 63 Problem 64 Problem 65 Problem 66 Problem 67 Problem 68 Problem 69 Problem 70 Problem 71 Problem 72 Problem 73 Problem 74 Problem 75 Problem 76 Problem 77 Problem 78 Problem 79 Problem 80 Problem 81 Problem 82 Problem 83 Problem 84 Problem 85 Problem 86 Problem 87 Problem 88 Problem 89 Problem 90 Problem 91 Problem 92 Problem 93 Problem 94 Problem 95 Problem 96 Problem 97 Problem 98 Problem 99 Problem 100 Problem 101 Problem 102 Problem 103 Problem 104 Problem 105

Problem 55 Medium Difficulty

The density of a certain gaseous fluoride of phosphorus is 3.93 g/L at STP. Calculate the molar mass of this fluoride and determine its molecular formula.

Answer

$\mathrm{PF}_{3}$

More Answers

01:45

Aadit S.

02:02

Charotte M.

Related Courses

Chemistry 101
Chemistry

Chapter 9

Gases

Related Topics

Gases

Discussion

You must be signed in to discuss.
Top Chemistry 101 Educators
Nadia L.

Rice University

Stephen P.

Drexel University

Allea C.

University of Maryland - University College

KS
Karli S.
Chemistry 101 Courses

Lectures

Video Thumbnail

05:03
Gases - Intro

In physics, a gas is one o…
Video Thumbnail

04:46
Characteristics Of Gases

In physics, thermodynamics…
Join Course
Recommended Videos

01:32

The density of phosphorus …

01:43

What is the molecular form…

02:26

Elemental phosphorus occur…

01:59

Use the molar volume of a …

01:08

Use the molar volume of a …

03:05

How many grams of phosphor…

01:28

What is the molar mass of …

05:08

The density of a mixture o…

03:39

Tin(II) fluoride $\left(\m…

01:42

Tin(II) fluoride $\left(\m…

03:22

A gas containing chlorine …

02:26

When 1.00 $\mathrm{mg}$ of…

00:54

Copper(II) fluoride contai…

01:54

At STP, $0.280 \mathrm{L}$…

02:17

At STP, 0.280 L of a gas w…

03:24

A colorless liquid compose…

02:17

A given sample of a xenon …

02:15

A given sample of a xenon …

02:25

Copper(II) fluoride contai…

01:21

A gaseous hydrocarbon weig…

Watch More Solved Questions in Chapter 9

Problem 1
Problem 2
Problem 3
Problem 4
Problem 5
Problem 6
Problem 7
Problem 8
Problem 9
Problem 10
Problem 11
Problem 12
Problem 13
Problem 14
Problem 15
Problem 16
Problem 17
Problem 18
Problem 19
Problem 20
Problem 21
Problem 22
Problem 23
Problem 24
Problem 25
Problem 26
Problem 27
Problem 28
Problem 29
Problem 30
Problem 31
Problem 32
Problem 33
Problem 34
Problem 35
Problem 36
Problem 37
Problem 38
Problem 39
Problem 40
Problem 41
Problem 42
Problem 43
Problem 44
Problem 45
Problem 46
Problem 47
Problem 48
Problem 49
Problem 50
Problem 51
Problem 52
Problem 53
Problem 54
Problem 55
Problem 56
Problem 57
Problem 58
Problem 59
Problem 60
Problem 61
Problem 62
Problem 63
Problem 64
Problem 65
Problem 66
Problem 67
Problem 68
Problem 69
Problem 70
Problem 71
Problem 72
Problem 73
Problem 74
Problem 75
Problem 76
Problem 77
Problem 78
Problem 79
Problem 80
Problem 81
Problem 82
Problem 83
Problem 84
Problem 85
Problem 86
Problem 87
Problem 88
Problem 89
Problem 90
Problem 91
Problem 92
Problem 93
Problem 94
Problem 95
Problem 96
Problem 97
Problem 98
Problem 99
Problem 100
Problem 101
Problem 102
Problem 103
Problem 104
Problem 105

Video Transcript

Yeah. All right. So, let's try to find um the formula. And the molar mass of the substance that we know contains phosphorus and floor een. And what we do know is that the density of this substance is 3.93 grams per leader at STP. So STP is standard temperature and pressure 0°C, one atmosphere. Now, this is an important um uh thing to know because there's a shortcut for us to be able to get to our molar mass. Because at STP one mole of any gas doesn't matter what it is. Any gas has a volume Of 22.4 L. So, how are we gonna use that? Well, we know what the definition is of molar mass. It's grams per mole. So, let's use our density. And the fact that 22.4 leaders is one mole at STP to convert two g per mole. So, if we take our 3.93 grams per leaders, that's per one leader. And we multiply that by the fact that we know that there's 22 .4 leaders in every one mole, then that means to our three significant figures that we have because our one leader and our one moller infinite That we have a molar mass of 88.0 g per mole. Mhm. All right. So, we've got molar mass. How are we going to use that to figure out the formula? Well, um what do we know about phosphorous and flooring? Well, the Mass of phosphorus. If you look at your periodic table is 30.97 grams per mole. Floor een Is 19.0 g per mole. So how can we get these two equal 88. Well, um, Let's make this number 23 significant. We know that we're going to have to use only three significant figures with addition and subtraction. So we can say that this is essentially equal to 31.0. And so what we're gonna do with that? Well, if we had one phosphorus at 31, but the total was 88, 88.0 -31.0 is 57 zero. So by using this 31, I've used a phosphorus now Florian is 19 and it turns out that if I use 3 19 that will use all of my mass. So I used a floor een and a floor green and a floor een. So now I've used all 88 g per mole. I've used a phosphorus and three floor Eanes. So we write that is P. F three. So phosphorus try fluoride is the formula of our substance

Get More Help with this Textbook
Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson

Chemistry

View More Answers From This Book

Find Another Textbook

Related Topics

Gases
Top Chemistry 101 Educators
Theodore D.

Carleton College

Nadia L.

Rice University

Allea C.

University of Maryland - University College

Jake R.

University of Toronto

Chemistry 101 Courses

Lectures

Video Thumbnail

05:03
Gases - Intro

In physics, a gas is one of the three major states of matter (the others bei…
Video Thumbnail

04:46
Characteristics Of Gases

In physics, thermodynamics is the science of energy and its transformations.…
Join Course
Recommended Videos

01:32

The density of phosphorus vapor is $2.64 \mathrm{g} / \mathrm{L}$ at $310^{\cir…

01:43

What is the molecular formula of a gaseous fluoride of sulfur containing $70.4 …

02:26

Elemental phosphorus occurs as tetratomic molecules, $\mathrm{P}_{4}$ . What m…

01:59

Use the molar volume of a gas at STP to calculate the density (in g/L) of nitro…

01:08

Use the molar volume of a gas at STP to calculate the density (in g>L) of nitro…

03:05

How many grams of phosphorus react with 35.5 $\mathrm{L}$ of $\mathrm{O}_{2}$ a…

01:28

What is the molar mass of a gas found to have a density of $0.841 \mathrm{g} / …

05:08

The density of a mixture of fluorine and chlorine gases is $1.77 \mathrm{g} / \…

03:39

Tin(II) fluoride $\left(\mathrm{SnF}_{2}\right)$ is often added to toothpaste a…

01:42

Tin(II) fluoride $\left(\mathrm{SnF}_{2}\right)$ is often added to toothpaste a…

03:22

A gas containing chlorine and oxygen has a density of $2.875 \mathrm{g} / \math…

02:26

When 1.00 $\mathrm{mg}$ of lithium metal is reacted with fluorine gas $\left(\m…

00:54

Copper(II) fluoride contains 37.42$\% \mathrm{F}$ by mass. Calculate the mass o…

01:54

At STP, $0.280 \mathrm{L}$ of a gas weighs $0.400 \mathrm{g}$. Calculate the mo…

02:17

At STP, 0.280 L of a gas weighs 0.400 g. Calculate the molar mass of the gas.

03:24

A colorless liquid composed of $46.68 \%$ nitrogen and $53.32 \%$ oxygen has a …

02:17

A given sample of a xenon fluoride compound contains molecules of the type $\ma…

02:15

A given sample of a xenon fluoride compound contains molecules of the type $\ma…

02:25

Copper(II) fluoride contains 37.42$\% \mathrm{F}$ by mass. Calculate the mass o…

01:21

A gaseous hydrocarbon weighing $0.231 \mathrm{g}$ occupies a volume of $102 \ma…
Additional Chemistry Questions
use-the-standard-entropy-data-in-appendix-g-to-determine-the-change-in-entropy-for-each-of-the-react

04:47

Use the standard entropy data in Appendix G to determine the change in entro…

the-ionic-radii-of-the-ions-s2-cl-and-k-are-184-181-138-pm-respectively-e

01:45

The ionic radii of the ions ${S}^{2-}, {Cl}^{-},$ and ${K}^{+}$ are 184, 181…

use-the-molecule-shape-simulator-httpopenstaxcollegeorgl16molecshape-to-explore-real-molecu-2

02:30

Use the Molecule Shape simulator (http://openstaxcollege.org/l/16MolecShape)…

a-mixture-of-0200-g-of-mathrmh_2-100-mathrmg-of-mathrmn_2-and-0820-g-of-ar-i

01:54

A mixture of 0.200 g of $\mathrm{H}_{2}, 1.00 \mathrm{g}$ of $\mathrm{N}_{2}…

the-types-of-intermolecular-forces-in-a-substance-are-identical-whether-it-is-a-solid-a-liquid-or

00:38

The types of intermolecular forces in a substance are identical whether it i…

identify-two-common-observations-indicating-some-liquids-have-sufficient-vapor-pressures-to-noticeab

01:07

Identify two common observations indicating some liquids have sufficient vap…

calculate-the-hydrogen-ion-concentration-and-the-hydroxide-ion-concentration-in-wine-from-its-ph-se

00:57

Calculate the hydrogen ion concentration and the hydroxide ion concentration…

using-the-bond-energies-in-table-72-determine-the-approximate-enthalpy-change-for-each-of-the-foll

01:44

Using the bond energies in Table 7.2, determine the approximate enthalpy cha…

a-commercial-mercury-vapor-analyzer-can-detect-in-air-concentrations-of-gaseous-hg-atoms-which-ar

02:29

A commercial mercury vapor analyzer can detect, in air, concentrations of ga…

calculate-the-mole-fraction-of-each-solute-and-solvent-a-0710-kg-of-sodium-carbonate-washing-s

03:33

Calculate the mole fraction of each solute and solvent:
(a) 0.710 kg of s…

Add To Playlist

Hmmm, doesn't seem like you have any playlists. Please add your first playlist.

Create a New Playlist

`

Share Question

Copy Link

OR

Enter Friends' Emails

Report Question

Get 24/7 study help with our app

Available on iOS and Android

About
  • Our Story
  • Careers
  • Our Educators
  • Numerade Blog
Browse
  • Bootcamps
  • Books
  • Topics
  • Test Prep
  • Ask Directory
Support
  • Help
  • Privacy Policy
  • Terms of Service
Get started