{"id":187293,"date":"2025-02-04T06:05:48","date_gmt":"2025-02-04T06:05:48","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=187293"},"modified":"2025-02-04T06:05:50","modified_gmt":"2025-02-04T06:05:50","slug":"chloropicrin-also-known-as-ps-and-nitrochloroform","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/04\/chloropicrin-also-known-as-ps-and-nitrochloroform\/","title":{"rendered":"Chloropicrin, also known as PS and nitrochloroform"},"content":{"rendered":"\n<p>Chloropicrin, also known as PS and nitrochloroform, is a chemical compound currently used as a broad-spectrum antimicrobial, fungicide, herbicide, insecticide, and nematicide. In World War I, the Germans used it as tear gas since it is also an airway irritant. This substance is a liquid at room temperatures. Suppose there was a small spill of this material on a paved surface at a chemical plant. The spill has a width of 0.8 ft and a length of 2.5 ft. The prevailing wind is 10 miles per hour in a direction parallel to the length of the spilled material. Estimate the rate of evaporation in grams per hour of this material. Chloropicrin has a diffusivity in air of 0.088 cm2 s\u22121. At 25\u00b0C, its vapor pressure is such that its equilibrium concentration in air would be equal to 0.211 g L\u22121. The kinematic viscosity of air under these conditions is 0.157 cm2 s\u22121. Carefully state your assumptions.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>To estimate the evaporation rate of chloropicrin from a spill on a paved surface, we can use the following formula:<\/p>\n\n\n\n<p>[ E = \\frac{0.1288 \\cdot A \\cdot P \\cdot M^{0.667} \\cdot u^{0.78}}{T} ]<\/p>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>( E ) is the evaporation rate in kg\/min,<\/li>\n\n\n\n<li>( A ) is the surface area of the spill in m\u00b2,<\/li>\n\n\n\n<li>( P ) is the vapor pressure of chloropicrin in kPa,<\/li>\n\n\n\n<li>( M ) is the molecular weight of chloropicrin in g\/mol,<\/li>\n\n\n\n<li>( u ) is the wind speed in m\/s,<\/li>\n\n\n\n<li>( T ) is the absolute temperature in Kelvin.<\/li>\n<\/ul>\n\n\n\n<p><strong>Given Data:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spill dimensions: 0.8 ft (width) \u00d7 2.5 ft (length)<\/li>\n\n\n\n<li>Wind speed: 10 miles per hour<\/li>\n\n\n\n<li>Vapor pressure of chloropicrin at 25\u00b0C: 0.211 g\/L<\/li>\n\n\n\n<li>Molecular weight of chloropicrin: 164.38 g\/mol<\/li>\n\n\n\n<li>Temperature: 25\u00b0C (298.15 K)<\/li>\n<\/ul>\n\n\n\n<p><strong>Conversions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Surface Area:<\/strong> 0.8 ft \u00d7 2.5 ft = 2.0 ft\u00b2<\/li>\n\n\n\n<li>Converting to square meters:\n<ul class=\"wp-block-list\">\n<li>1 ft\u00b2 = 0.092903 m\u00b2<\/li>\n\n\n\n<li>2.0 ft\u00b2 \u00d7 0.092903 m\u00b2\/ft\u00b2 = 0.1858 m\u00b2<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Wind Speed:<\/strong> 10 miles per hour<\/li>\n\n\n\n<li>Converting to meters per second:\n<ul class=\"wp-block-list\">\n<li>1 mile = 1609.34 meters<\/li>\n\n\n\n<li>1 hour = 3600 seconds<\/li>\n\n\n\n<li>(10 miles\/hour) \u00d7 (1609.34 meters\/mile) \/ (3600 seconds\/hour) \u2248 4.47 m\/s<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Vapor Pressure:<\/strong> 0.211 g\/L<\/li>\n\n\n\n<li>Converting to kPa:\n<ul class=\"wp-block-list\">\n<li>1 g\/L = 1 kg\/m\u00b3<\/li>\n\n\n\n<li>Using the ideal gas law:<\/li>\n\n\n\n<li>PV = nRT<\/li>\n\n\n\n<li>P = (C \u00d7 R \u00d7 T) \/ M<\/li>\n\n\n\n<li>Where:\n<ul class=\"wp-block-list\">\n<li>C = concentration in kg\/m\u00b3<\/li>\n\n\n\n<li>R = 8.314 J\/(mol\u00b7K)<\/li>\n\n\n\n<li>T = temperature in K<\/li>\n\n\n\n<li>M = molecular weight in kg\/mol<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>P = (0.211 kg\/m\u00b3 \u00d7 8.314 J\/(mol\u00b7K) \u00d7 298.15 K) \/ 0.16438 kg\/mol<\/li>\n\n\n\n<li>P \u2248 3.19 kPa<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Calculation:<\/strong><br>[ E = \\frac{0.1288 \\times 0.1858 \\, \\text{m}^2 \\times 3.19 \\, \\text{kPa} \\times (164.38)^{0.667} \\times (4.47)^{0.78}}{298.15} ]<\/p>\n\n\n\n<p>[ E \\approx \\frac{0.1288 \\times 0.1858 \\times 3.19 \\times 45.89 \\times 3.72}{298.15} ]<\/p>\n\n\n\n<p>[ E \\approx \\frac{35.6}{298.15} ]<\/p>\n\n\n\n<p>[ E \\approx 0.1194 \\, \\text{kg\/min} ]<\/p>\n\n\n\n<p>Converting to grams per hour:<\/p>\n\n\n\n<p>[ 0.1194 \\, \\text{kg\/min} \\times 1000 \\, \\text{g\/kg} \\times 60 \\, \\text{min\/hour} = 7164 \\, \\text{g\/hour} ]<\/p>\n\n\n\n<p><strong>Assumptions:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Temperature Uniformity:<\/strong> The temperature of the spilled chloropicrin is assumed to be uniform and equal to the ambient temperature of 25\u00b0C.<\/li>\n\n\n\n<li><strong>Steady-State Conditions:<\/strong> The evaporation rate is calculated under steady-state conditions, implying that the rate remains constant over time.<\/li>\n\n\n\n<li><strong>Negligible Heat Transfer Effects:<\/strong> Heat transfer between the liquid, air, and the paved surface is assumed to be negligible, meaning the evaporation is primarily driven by the vapor pressure and wind speed.<\/li>\n\n\n\n<li><strong>Ideal Gas Behavior:<\/strong> The vapor behaves as an ideal gas, allowing the use of the ideal gas law for conversions.<\/li>\n\n\n\n<li><strong>Consistent Wind Speed:<\/strong> The wind speed is constant at 10 miles per hour, and it flows parallel to the length of the spill, enhancing evaporation.<\/li>\n\n\n\n<li><strong>Flat Surface:<\/strong> The paved surface is flat and impermeable, preventing any infiltration of the liquid.<\/li>\n<\/ol>\n\n\n\n<p>This estimation provides a theoretical evaporation rate based on the given parameters and assumptions. In real-world scenarios, factors such as surface roughness, ambient humidity, and potential chemical interactions could influence the actual evaporation rate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chloropicrin, also known as PS and nitrochloroform, is a chemical compound currently used as a broad-spectrum antimicrobial, fungicide, herbicide, insecticide, and nematicide. In World War I, the Germans used it as tear gas since it is also an airway irritant. This substance is a liquid at room temperatures. Suppose there was a small spill of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-187293","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/187293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=187293"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/187293\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=187293"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=187293"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=187293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}