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

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.<br /><br />Given information:<br />- Mass of histamine: 385 mg<br />- Mass of carbon: 208 mg<br />- Mass of hydrogen: 31 mg<br />- Mass of nitrogen: 146 mg<br />- Molar mass of histamine: 111 g/mol<br /><br />Step 1: Convert the mass of each element to moles.<br />Moles of carbon = 208 mg / (12.01 g/mol) = 0.0173 mol<br />Moles of hydrogen = 31 mg / (1.008 g/mol) = 0.0309 mol<br />Moles of nitrogen = 146 mg / (14.01 g/mol) = 0.0104 mol<br /><br />Step 2: Find the simplest whole number ratio of the moles of each element.<br />The smallest number of moles is 0.0104 mol (nitrogen).<br />Ratio of carbon: 0.0173 mol / 0.0104 mol = 1.67<br />Ratio of hydrogen: 0.0309 mol / 0.0104 mol = 3<br />Ratio of nitrogen: 0.0104 mol / 0.0104 mol = 1<br /><br />The simplest whole number ratio is 1:3:1, which corresponds to the empirical formula C1H3N1.<br /><br />Step 3: Determine the molecular formula.<br />Molar mass of the empirical formula (C1H3N1) = 12.01 g/mol + (3 × 1.008 g/mol) + 14.01 g/mol = 43.06 g/mol<br />Molecular formula = (111 g/mol) / (43.06 g/mol) × (C1H3N1) = C5H9N5<br /><br />Therefore, the molecular formula of histamine is C5H9N5.