A sample contains 43.7% phosphorus and 56.3% oxygen by mass. Determine its empirical formula. Write your answer in PxOy format. Atomic Mass: P: 30.974 g/mol O: 15.999 g/mol The empirical formula is

1. A compound (molar mass= 324.41 g/mol) is used as a cardiac depressant. It has this percent composition by mass. 74.04% C; 7.46% H, 8.64% N; and 9.86% O. Use these data to determine the empirical formula and molecular formula of that compound. 2. Give the family name (i.e noble gas, halogen, alkali, or alkaline earth metal) for the following elements: I) Calcium II) Bromine III) Potassium IV) Barium V) Neon

1. Calculate the number of moles of chlorine in 2.34 x 1019 molecules of chlorine. 2. Calculate the number of molecules of water in a 500.0-mL glass of water. (Note: assume density of water is 1.000 g/mL) 3. Calculate the number of moles of carbon atoms in 50.0 g CS2. 4. Calculate the molar mass of potassium carbonate, K2CO3.

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From the given empirical formula and molar mass, find the molecular formula of each compound. Express your answer as a chemical formula. C6H7N, 372.53 g/mol C2HCl, 241.92 g/mol C5H10NS2, 296.56 g/mol

A certain chemical substance has the following percent composition by mass. Element Mass Percent carbon 25.29% hydrogen 3.891% bromine 56.08% nitrogen 14.75%     Determine the empirical formula for the compound.Enter your answer without subscripts. C12H21Cl3 should be entered as C12H21Cl3. Enter elements in the order C, H, followed by the remaining elements alphabetically. Single elements do not need to have a subscript. CH4 should be entered as CH4, not C1H4.Empirical Formula: Answer

Use percent composition and molar mass to determine molecular formula. Analysis of a compound of carbon, hydrogen and oxygen showed that it is 52.13% C and 13.15% H, with O accounting for the remainder. In a separate experiment, the molar mass of the compound was found to be 46.08 g/mol. Determine the molecular formula of the compound. Enter the elements in the order C, H, O.

Vitamin c is known chemically by the name ascorbic acid. Determine the empirical formula of ascorbic acid if it is composed of 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen.

Sample A 8.074 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 20.88 grams of CO₂ and 4.274 grams of H₂O are produced. In a separate experiment, the molar mass is found to be 136.2 g/mol. Determine the empirical formula and the molecular formula of the organic compound. (Enter the elements in the order C, H, O.) Empirical formula: Molecular formula:

From the given empirical formula and molar mass, find the molecular formula of each compound. Express your answer as a chemical formula. C6H7N, 279.39 g/mol C2HCl, 120.94 g/mol   C5H10NS2, 444.83 g/mol