Homework Answers

Vanillin, the compound responsible for the flavour vanilla, has a percentage composition of 63.2% C,

5.26% H, and 31.6% O by mass. Determine the empirical formula of vanillin.

A forensic scientist analyzes a sample for sodium arsenate, Na 3 AsO 4 (s), a source of arsenic. Calculate

the percentage composition of sodium arsenate.

he average human requires 120.0 g of glucose (C6H12O6) per day. How many grams of CO2 (in the photosynthesis reaction) are required in order to produce this amount of glucose?

The photosynthesis reaction is:     6CO2 + 6H2O -> C6H12O6 -> 6O2

In a certain reaction, element X was converted to X2-. In the reaction, X acts as

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1. The combustion of benzene is the following reaction:

C₆H₆ (l) + 7.5 O₂ (g) è 6 CO₂ (g) + 3 H₂O (g) Δ H =?

Using Hess’ Law, find the enthalpy change, Δ H, for this reaction by combining these reactions:

 6 C (graphite) + 3 H₂ (g) è C₆H₆ (l)  ΔH = + 49.0 kJ

C (graphite) + O₂ (g) è CO₂ (g)  ΔH = -394 kJ 

H₂ (g) + ½ O₂ (g) è HOH (l)  ΔH = -286 kJ

Using Bond energy reference sheet to calculate Δ H for the balanced reaction below:

C₈H₁₈ (l) + 12.5 O₂ (g) è 8 CO₂ (g) + 9 HOH (g)

Determine the Molarity of a solution made by dissolving 21.6 grams of sodium carbonate, Na₂CO_3, in enough water to make 400.0 ml of solution.

How much acid and water are needed to dilute 12.0 M concentrated hydrochloric acid HCl, to make 4.00 liters of a 3.00 M solution?

How many grams of sodium bicarbonate, NaHCO₃, are needed to make 200.0 ml of a 0.250 M solution?