题目
题目
单项选择题

Which of the following diagrams illustrates the law of multiple proportions?

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思路分析
The question asks: Which of the following diagrams illustrates the law of multiple proportions? However, there are no answer options provided to evaluate. To reason about the concept itself, the law of multiple proportions states that when two elements form more than one compound, the......Login to view full explanation

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Question textBelow is the reaction you will be performing today: To perform the synthesis you will be using the following reagents: [table] p-aminobenzoic acid (PABA) | ethanol M = 137.14 g mol-1 | M = 47.07 g mol-1 0.80 g | 10 mL (density: 0.789 g mL-1) [/table] Calculate (to 2 significant figures): No. of moles of PABA: Answer 1 Question 4[input] mol Mass of ethanol: Answer 2 Question 4[input] grams No. of moles of ethanol: Answer 3 Question 4[input] mol Determine the molar ratio of PABA : ethanol being used today (round to the nearest integer): [table] PABA | : | ethanol Ratio = nPABA / nPABA | | Ratio = nethanol / nPABA Ratio =  1 | : | Answer 4 Question 4 [/table] Out of PABA and ethanol, which reagent will be used in excess? Multiple choice 1 Question 41. PABA2. Ethanol3. Neither is in excess – they will be used in their stoichiometric ratios

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