l,{"backHref":"/gcse/chemistry/edexcel/questions","basePath":"/gcse/chemistry/edexcel/calculations-involving-masses/questions","formulaUrl":null,"initialIndex":28,"initialQuestionWindow":[{"id":"1778c3f6-c6de-4853-b06a-2273be601cfe","revisionId":"99c9f9c6-a887-4475-b476-db6f0c4b7dd4","questionNumber":null,"questionType":"LA","specification":"During a catalytic cracking experiment in a sealed laboratory reactor, a sample of $242.8\\text{ g}$ of tetradecane ($C_{14}H_{30}$) is completely decomposed into a mixture of smaller alkanes and alkenes.","difficulty":5,"difficultyBand":"easy","totalMarks":1,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"263c09a2-fca3-4ee4-8c90-2876f6d6b87d","label":null,"content":"State the total mass of the mixture of products collected from the reactor.","markscheme":"- States $242.8\\text{ g}$ (accept $242.8$ without units) B1","marks":1,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"1a7d84c6-98a2-4818-821c-828903f8ecd0","revisionId":"57ebfc42-fa2c-45e8-afa6-75ef7d74ce1e","questionNumber":null,"questionType":"LA","specification":"Aluminium sulfate, $\\text{Al}_2(\\text{SO}_4)_3$, is widely used in municipal water treatment plants to coagulate suspended impurities.","difficulty":4,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"9c0c9f13-62cf-445b-8bfa-1da4ee47b5de","label":null,"content":"Calculate the relative formula mass of aluminium sulfate.\n\n(Relative atomic masses: $\\text{O} = 16$, $\\text{Al} = 27$, $\\text{S} = 32$)","markscheme":"- Shows a correct method to calculate the relative formula mass, e.g. $(2 \\times 27) + 3 \\times (32 + [4 \\times 16])$ or $54 + 96 + 192$ M1\n- Obtains the correct relative formula mass of $342$ A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"1ae41fb1-85e4-4051-8299-8029feae0b73","revisionId":"7d2d2502-bd1c-43d1-b26c-b24a92651485","questionNumber":null,"questionType":"LA","specification":"","difficulty":2,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"4c23888a-e526-4e70-8ec4-9e3f93a52f11","label":null,"content":"Calculate the relative formula mass ($M_{\\text{r}}$) of copper sulfate, $\\text{CuSO}_4$.\n\n(Relative atomic masses: $\\text{O} = 16.0$, $\\text{S} = 32.0$, $\\text{Cu} = 63.5$)","markscheme":"- Shows correct substitution of relative atomic masses: $63.5 + 32.0 + (4 \\times 16.0)$ M1\n- Calculates the correct relative formula mass: $159.5$ A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_chemistry","summaries":[{"id":"0022739c-a336-4f02-b237-23301e5ab290","difficultyBand":"medium","calculatorUse":null},{"id":"00a695e1-8f94-48c2-9ede-d32dde228113","difficultyBand":"medium","calculatorUse":null},{"id":"03c04d6b-1955-4456-84ef-f2ad729be875","difficultyBand":"easy","calculatorUse":null},{"id":"06b9594e-3eea-4ab8-bb79-128debcd69a8","difficultyBand":"medium","calculatorUse":null},{"id":"071115fb-bca3-4b14-a6ad-fec7ce84b5ce","difficultyBand":"medium","calculatorUse":null},{"id":"0824b601-d441-453f-aea8-4a33937d2ca4","difficultyBand":"medium","calculatorUse":null},{"id":"0927ff25-5f33-4482-b3f6-845eed9dda56","difficultyBand":"medium","calculatorUse":null},{"id":"095f0386-0224-4019-9436-c450eeeedee2","difficultyBand":"medium","calculatorUse":null},{"id":"0ad6f0c0-37a6-4bc9-9e56-65cbf20690f3","difficultyBand":"medium","calculatorUse":null},{"id":"0b657b9b-ef60-48f0-bad1-f87f94ad702f","difficultyBand":"easy","calculatorUse":null},{"id":"0d460fbc-6e0d-417c-a23e-5c6c661a65b4","difficultyBand":"medium","calculatorUse":null},{"id":"0dea3bb4-9f93-4eff-b73a-4155fd946467","difficultyBand":"easy","calculatorUse":null},{"id":"0e60d318-d882-419c-adb3-1d55a67dc61e","difficultyBand":"medium","calcula

Calculations involving masses

Question 13

Calculations involving masses Questions

Calculations involving masses

Question 13

Calculations involving masses Questions