Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft×15.0 ft×9.10ft.?

becca 12/07/2017. 3 answers
Science & Mathematics Chemistry

Hydrogen cyanide, HCN, is a poisonous gas. The lethal dose is approximately 300. mg HCN per kilogram of air when inhaled. The density of air at 26 ∘C is 0.00118 g/cm3.

3 Answers


Dr W 03/23/2018.

first of all.. that toxicity data isn't correct. It should have a type and a time and a beast attached to it. Imagine a room with 1000ppm HCN vs a room with 100ppm HCN. It wouldn't take as long to breathe in a lethal dose of HCN in that concentrated room than it would in the dilute room. And rats and mice and monkeys and dogs and humans all respond differently to HCN absorption. And the way we test might be... to a concentration that kills 50% of a test population in say 10min vs a concentration where only 1 beast has ever died.

examples

.. LC50 = 323 mg HCN / kg air @ 5min for mouse

.. LC50 = 208 mg HCN / kg air @ 30 min for rabbit

.. LCLo = 200 mg HCN / kg air @ 10 min for human

those mean

.. 50% of a test population of a particular mouse breed will die after 5 min exposure of 323mg / kg

.. 50% of a test population of a particular breed of rabbit will die after a 30 min exposure of 208 mg / kg

.. the lowest ever recorded human death for 200mg HCN / kg air occured after 10 min exposure.

**********

in any case, your 300mg / kg air is problably

.. LC50 = 300mg HCN / kg air for 5 min exposure of a mouse. Humans are different! exposure time would be different!

point is..

.. lower concentrations can be just as deadly if the exposure is longer

.. higher concentrations can be easily survived if exposure time is short

.. it's not the concentration that makes it lethal... it's the concentration + exposure time.

anyway

(12.0ft * 15.0ft * 9.10ft) * (12in / 1ft)³ * (2.54cm / 1in)³ * (1.18x10^-6kg air / cm³) * (300mgHCl / kg air) = 1.64x10^4mg HCN


Roger the Mole 03/23/2018.

(12.0 ft × 15.0 ft × 9.10 ft) x (28316.847 cm^3/ft^3) x (0.00118 g/cm^3) / (1000 g/kg) x (0.300 g HCN/kg) = 16.4 g HCN


Anonymous 03/23/2018.

I'll be honest with you, I have no idea what you said.


HighResolutionMusic.com - Download Hi-Res Songs

1 Alan Walker

On My Way flac

Alan Walker. 2019. Writer: Alan Walker;Sabrina Carpenter;Farruko.
2 CHVRCHES

Here With Me flac

CHVRCHES. 2019. Writer: Steve Mac;Martin Doherty;Marshmello;Lauren Mayberry;Iain Cook.
3 5 Seconds Of Summer

Who Do You Love flac

5 Seconds Of Summer. 2019. Writer: Andrew Taggart;Talay Riley;Oak;Sean Douglas;Luke Hemmings;Calum Hood;Ashton Irwin;Michael Clifford;Trevorious;Zaire Koalo.
4 Bonn

No Sleep flac

Bonn. 2019. Writer: Albin Nedler;Bonn;Martin Garrix.
5 Katy Perry

365 flac

Katy Perry. 2019. Writer: Zedd;Katy Perry;Caroline Ailin;Corey Sanders;Daniel Davidsen;Cutfather;Peter Wallevik.
6 Avril Lavigne

Crush flac

Avril Lavigne. 2019. Writer: Johan Carlsson;Avril Lavigne;Zane Carney.
7 Alan Walker

Are You Lonely flac

Alan Walker. 2019.
8 Brooks

Better When You're Gone flac

Brooks. 2019. Writer: David Guetta;Emma Lov Block;Ido Zmishlany;Jackson Foote;Jeremy Dussolliet;Brooks.
9 Jonas Brothers

Sucker flac

Jonas Brothers. 2019. Writer: Kevin Jonas;Joe Jonas;Nick Jonas;Ryan Tedder;Louis Bell;Frank Dukes.
10 DEAMN

Happy flac

DEAMN. 2019.
11 Ariana Grande

Bloodline flac

Ariana Grande. 2019. Writer: ILYA;Max Martin;Savan Kotecha;Ariana Grande.
12 Ariana Grande

Imagine flac

Ariana Grande. 2019. Writer: JProof;Priscilla Renea;Happy Perez;Andrew "Pop" Wansel;Ariana Grande.
13 Ariana Grande

NASA flac

Ariana Grande. 2019. Writer: Ariana Grande;Scootie;Tayla Parx;TBHits;Victoria Monét.
14 IZ*ONE

Rise flac

IZ*ONE. 2019.
15 Dzeko

Halfway There flac

Dzeko. 2019.
16 Ellie Goulding

Flux flac

Ellie Goulding. 2019. Writer: Joe Kearns;Jim Eliot;Ellie Goulding.
17 Tiffany Young

Born Again flac

Tiffany Young. 2019. Writer: Fiction;Satica;Tiffany Young.
18 Ava Max

So Am I flac

Ava Max. 2019. Writer: Cirkut;Ava Max.
19 P!nk

Walk Me Home flac

P!nk. 2019. Writer: P!nk;Scott Harris;Nate Ruess.
20 Dido

Hurricanes flac

Dido. 2019. Writer: Dido;Rick Nowels;Rollo Armstrong.

Language

Categories