Other Chemistry Answers

 Calculate the mass of the product of 6.40 g of magnesium with 1.32 g of oxygen . 

If you have 45.6 g NH3, how many grams of F2 are required for a complete reaction? Need to show ALL calculation work.

What is the boiling point elevation constant of urea

How much energy is required to change 25 g of ice at -20 degrees C into water at 20 degrees C?

How could you prepare 250 ml 0.20M using only a solution of 1.0M NaCl and water?

A solution of Na3PO4 that is 0.2000N as a salt is used to precipitate the Mg as MgNH4PO4 from a sample of dolomite containing 14.01% MgCO3. What volume is theoretically required if 2.0000g of sample is dissolved in water and diluted to 250 mL and an aliquot of 50 mL is used?

A sample is analyzed for chloride by the Volhard method. From the following data, calculate the percentage of chloride present: Weight of sample = 6.0000 g dissolved and diluted to 200 mL Aliquot used = 25.00 mL AgNO3 added = 40.00ml of 0.1234M KSCN for back titration = 13.20ml of 0.0930M

Solve the enthalpy of methane formation using the following reaction equations

1. "2H\u2082(g)+O\u2082(g) \u2192 2H\u2082O(g)" "\u2206H = -571,6 kJ"
2. "\ufeffC(s)+O\u2082(g) \u2192 CO\u2082(g)" "\u2206H = -393,5 kJ"
3. CH₄ (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O (g) "\u2206H = -889,8 kJ"

Determine the temperature change that occurs when 13.4 g of ammonium chloride dissolve into 2.00x10^2 g of water. The molar enthalpy of solution of ammonium chloride is 15.7 kJ/mol. Write a balanced thermochemical equation for the reaction and sketch an enthalpy diagram for this reaction.

Which observation provides information about the chemical properties of a substance?

a

.

The substance is a liquid at 25 o C.

b

.

The substance has a density of 2.50 g/cm 3 .

c

.

The substance burns brightly in air.

d

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The substance will not dissolve in water.