38. Calculate What is the enthalpy change (AH) in kJ for the following reaction?
2Al(s) + Fe2O3(s) -
- 2Fe(s) + A1,03(s)
Use the enthalpy changes for the combustion of
aluminum and iron:
2Al(s) + O2(g) - A1,03(s) AH = -1676.0 kJ
2Fe(s) + O2(g) - Fe,03() AH = -822.1 kJ
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One mole of zinc has a mass of 65.4 grams. approximately how many atoms of zinc are present in one mole of zinc? 32 × 1023 atoms 6 × 1023 atoms 66 atoms 65 atoms

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %