Question
3 Histamine is a substance that is released by cells in response to injury, infection stings, and materials that cause a as pollen. Histamine causes dilation of blood vessels and swelling due to accumulation of fluid in the tissues. People sometimes take anthistamine drugs to counter a mass of 385 mg is composed of 208 mg of carbon, 31 mg of hydrogen, and 146 mg of nitrogen The molar mass of histamine is 111g/mol What is the molecular formula of histamine? Multiple Choice 1 point
Solution
3.9
(313 Votos)
Maxeline
Elite · Tutor por 8 anos
Resposta
To determine the molecular formula of histamine, we need to calculate the number of moles of each element in the compound and then find the simplest whole number ratio.Given information:- Mass of histamine: 385 mg- Mass of carbon: 208 mg- Mass of hydrogen: 31 mg- Mass of nitrogen: 146 mg- Molar mass of histamine: 111 g/molStep 1: Convert the mass of each element to moles.Moles of carbon = 208 mg / (12.01 g/mol) = 0.0173 molMoles of hydrogen = 31 mg / (1.008 g/mol) = 0.0309 molMoles of nitrogen = 146 mg / (14.01 g/mol) = 0.0104 molStep 2: Find the simplest whole number ratio of the moles of each element.The smallest number of moles is 0.0104 mol (nitrogen).Ratio of carbon: 0.0173 mol / 0.0104 mol = 1.67Ratio of hydrogen: 0.0309 mol / 0.0104 mol = 3Ratio of nitrogen: 0.0104 mol / 0.0104 mol = 1The simplest whole number ratio is 1:3:1, which corresponds to the empirical formula C1H3N1.Step 3: Determine the molecular formula.Molar mass of the empirical formula (C1H3N1) = 12.01 g/mol + (3 × 1.008 g/mol) + 14.01 g/mol = 43.06 g/molMolecular formula = (111 g/mol) / (43.06 g/mol) × (C1H3N1) = C5H9N5Therefore, the molecular formula of histamine is C5H9N5.