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The enthalpy change under standard conditions for which of the reactions below would be equal to ΔHºf of NaOH(s)?

Calculate the energy of light emitted when the following transition occurs in a hydrogen atom: n=6 to n=3 Enter your value as a positive.

The complete combustion of an unknown organic compound (mm= 88.0 g/mol) released 673 kj of energy when 37.2 grams of the compound reacted in excess oxygen. Calculate the heat of combustion for the reaction.

Vanillin, C8H8O3 (mm= 152 g/mol), is the molecule responsible for the vanilla flavor in food. How many oxygen atoms are present in 45.0 mg sample of vanillin?

Which element has chemical properties most similar to those of P?

When 30.0 ml of 0.10 M AgNO3 is added to 30.0 ml of 0.10 M NaCl, aqueous NaNO3 and solid AgCl are formed. How much solid AgCl is produced?

A 10.00 g sample of a compound containing only carbon, hydrogen, and oxygen forms 23.98 g of CO2 and 4.91 g H2O upon complete combustion. What is the empirical formula of the compound?

Five successive determinations of the density of an alloy gave the following results: 10.29 g/ml 9.95 g/ml 10.06 g/ml 9.89 g/ml 10.18 g/ml What value should be reported for the density of this alloy?

MgCl2 is a strong electrolyte. If 17.16 g of MgCl2 is dissolved in 150.0 mL of solution: Calculate the concentration (molarity) of Mg2+ ion

This experiment can be considered accurate because the percent uncertainty is less than 5%