CHM 143 Lecture Notes - Lecture 18: Radiography, Photon, Electric Field

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3 Nov 2016

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Mole of a product from its elements in their standard states. Coefficients for reactants are placed to form 1 mole of a single product. Write chemical equation for standard enthalpy formation of ethanol (c2h6o) Gases: pure gas at 1 atm and 25 c. Liquids and solids: most stable form at 1 atm and 25 c. Calculate hreaction using standard enthalpy of formation values: Standard enthalpy formation ( h f) = the energy needed or released upon the formation of 1. C(s, graphite) + 2h2 (g) ch4 (g) h f= found in appendix. H f= for 1 mole, then if have 2 mole h = 2 x h f. Calculate h reaction for the following reaction using h f values. 2c(s, graphite) + 3h2 (g) + 1/2o2 (g) c2h6o (l) Amount of heat released for 1 mole c2h6o. Chapter 7 quantum mechanical model of an atom. Electromagnetic radiation (emr): energy in an oscillating electric and magnetic field.

Related Questions

What is the balanced chemical equation for the reaction used to calculate ÎHâf of CaCO3(s)? If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution. Express your answer as a chemical equation. The standard enthalpy of formation (ÎHâf) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 âC , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing ÎHâf values might look something like this: Substance ÎHâf H(g) 218 kJ/mol H2(g) 0 kJ/mol Ca(s) 0 kJ/mol Ca2+(aq) â543 kJ/mol C(g) 71 kJ/mol C(s) 0 kJ/mol N(g) 473 kJ/mol O2(g) 0 kJ/mol O(g) 249 kJ/mol S2(g) 129 kJ/mol

The standard enthalpy of formation (ÎHâf) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of25 âC , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing ÎHâf values might look something like this:

Substance	ÎHâf
H(g)	218 kJ/mol
H2(g)	0 kJ/mol
Ca(s)	0 kJ/mol
Ca2+(aq)	â543 kJ/mol
C(g)	71 kJ/mol
C(s)	0 kJ/mol
N(g)	473 kJ/mol
O2(g)	0 kJ/mol
O(g)	249 kJ/mol
S2(g)	129 kJ/mol

Part A

What is the balanced chemical equation for the reaction used to calculate ÎHâf of CaCO3(s)?

If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution.

Express your answer as a chemical equation.

CHM 143 Lecture Notes - Lecture 18: Radiography, Photon, Electric Field

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