// Numbas version: exam_results_page_options
{"name": "Moles of a substance 1", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"functions": {}, "extensions": [], "variablesTest": {"maxRuns": 100, "condition": ""}, "rulesets": {}, "preamble": {"js": "", "css": ""}, "variable_groups": [], "name": "Moles of a substance 1", "statement": "<p>Answer the following questions. Please enter your answers as decimals, not as fractions. Give your answers to 2 decimal places.</p>\n<p>If you would like to see how to do this question, click on 'Reveal answers' at the bottom of the page.</p>", "tags": ["molar", "molar calculations", "mole", "moles"], "ungrouped_variables": ["b", "a", "glucose", "NaCl"], "parts": [{"type": "gapfill", "showFeedbackIcon": true, "prompt": "<p>Glucose has a molecular weight of $\\var{glucose}$. How much does&nbsp;&nbsp;$\\var{0.25 * a}$&nbsp;mole(s) of glucose weigh in grams?</p>\n<p>[[0]] grams</p>", "variableReplacements": [], "showCorrectAnswer": true, "gaps": [{"correctAnswerStyle": "plain", "showFeedbackIcon": true, "variableReplacements": [], "type": "numberentry", "mustBeReduced": false, "variableReplacementStrategy": "originalfirst", "allowFractions": false, "showCorrectAnswer": true, "correctAnswerFraction": false, "minValue": "0.25 * a * glucose - 0.005", "mustBeReducedPC": 0, "notationStyles": ["plain", "en", "si-en"], "maxValue": "0.25 * a * glucose + 0.005", "scripts": {}, "marks": 1}], "marks": 0, "scripts": {}, "variableReplacementStrategy": "originalfirst"}, {"type": "gapfill", "showFeedbackIcon": true, "prompt": "<p>Sodium chloride has a molecular weight of $\\var{NaCl}$. How much does $\\var{0.25 * b}$ mole(s) of sodium chloride weigh in grams?</p>\n<p>[[0]] grams</p>", "variableReplacements": [], "showCorrectAnswer": true, "gaps": [{"correctAnswerStyle": "plain", "showFeedbackIcon": true, "variableReplacements": [], "type": "numberentry", "mustBeReduced": false, "variableReplacementStrategy": "originalfirst", "allowFractions": false, "showCorrectAnswer": true, "correctAnswerFraction": false, "minValue": "0.25 * b * NaCl - 0.005", "mustBeReducedPC": 0, "notationStyles": ["plain", "en", "si-en"], "maxValue": "0.25 * b * NaCl + 0.005", "scripts": {}, "marks": 1}], "marks": 0, "scripts": {}, "variableReplacementStrategy": "originalfirst"}], "advice": "<p>To answer these questions we use the formula</p>\n<p style=\"text-align: center;\">$\\text{molecular weight} \\times \\text{number of moles} = \\text{mass of substance (in grams)}$.</p>\n<p style=\"text-align: left;\">a)</p>\n<p style=\"text-align: left;\">Glucose has a molecular weight of $\\var{glucose}$. How much does&nbsp;&nbsp;$\\var{0.25 * a}$&nbsp;mole(s) of glucose weigh in grams?</p>\n<p style=\"text-align: left;\">Solution:</p>\n<p style=\"text-align: left;\">Putting our numbers into the formula we find that $\\var{0.25 * a}$&nbsp;mole(s) of glucose weighs</p>\n<p style=\"text-align: center;\">$\\var{glucose} \\times \\var{0.25 * a} = \\var{glucose * 0.25 * a}$ grams.</p>\n<p style=\"text-align: left;\">b)</p>\n<p style=\"text-align: left;\">Sodium chloride has a molecular weight of $\\var{NaCl}$. How much does $\\var{0.25 * b}$ mole(s) of sodium chloride weigh in grams?</p>\n<p style=\"text-align: left;\">Solution:</p>\n<p style=\"text-align: left;\">Putting our numbers into the formula we find that $\\var{0.25 * b}$&nbsp;mole(s) of sodium chloride weighs</p>\n<p style=\"text-align: center;\">$\\var{NaCl} \\times \\var{0.25 * b} = \\var{NaCl * 0.25 * b}$ grams.</p>", "variables": {"NaCl": {"description": "<p>Molecular weight of sodium chloride.</p>", "name": "NaCl", "definition": "58.44", "group": "Ungrouped variables", "templateType": "anything"}, "a": {"description": "", "name": "a", "definition": "random(1..10)", "group": "Ungrouped variables", "templateType": "anything"}, "b": {"description": "", "name": "b", "definition": "random(1..10 except a)", "group": "Ungrouped variables", "templateType": "anything"}, "glucose": {"description": "<p>molecular weight of glucose</p>", "name": "glucose", "definition": "180.16", "group": "Ungrouped variables", "templateType": "anything"}}, "metadata": {"licence": "Creative Commons Attribution 4.0 International", "description": "<p>Calculating mass of a substance given molecular weight and number of moles.</p>\n<p></p>"}, "type": "question", "contributors": [{"name": "Jamie Antoun", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/266/"}]}]}], "contributors": [{"name": "Jamie Antoun", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/266/"}]}