Chemistry Answers

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

Scandal porn galleries, daily updated lists

http://silver.ridge.gigixo.com/?makena

freebig boob porn movies how to watch porn past blocks jada fire marie luv lesbian porn index of mp4 3gp porn too young for porn videos

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?

Calculate the freezing point of a 4.00 molal solution of methanol, CH₃OH.