Chemistry Answers

An oxide is a compound that contains at least one oxygen atom and only one other element in its chemical formula. Using your knowledge of chemistry comment on the chemistry of oxides.

Given the following thermochemical equations and the corresponding enthalpy change for each reaction, calculate the heat of combustion of acetylene gas, C2H2

1. 2C (graphite) + H2 (g)               C2H2(g)      ∆H= + 226.7 kJ
2. C(graphite) + O2 (g)             CO2(g)         ∆H= - 393.5 kJ
3.  H2(g) + ½ O2 (g)            H2O (l)                ∆H= - 285.8 kJ

0.30 mol C3H6O0.30 mol C3H6Othe amount of heat released during the combustion of:

1. 0.30 mol C3H6O
2. 100 g of C3H6O

Write the thermochemical equation for the following reactions that occur at constant pressure:

1. One mole ammonium nitrate dissolve in water to produce aqueous ammonium ion and nitrate ions, accompanied by the absorption of 28.1 kJ of heat
2. Formation of carbon dioxide gas from carbon (graphite) and oxygen, yields 393.5 kJ of heat

50.0 ml of 2.50M Sulfuric acid reacted with 43.5ml 2.75 Aluminum hydroxide. The reaction yielded Aluminum sulfate and water. (Al=27g/mol, S=32g/mol, H=1g/mol, O=16g/mol)

1. Write the balance chemical equation.

2. What is the limiting reactant?

3. How much reactant is in excess?

4. How many grams of Aluminum sulfate will be produced?

If 3.2443 moles of carbon dioxide are produced, how many grams of iron (III) oxalate were reacted if the reaction proceeds with a 99.6% yield?

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What is the expression for Kc for this reaction Ni (CO)4 (g) ⇆ Ni (s) + 4CO (g)

What is the Ionic Strength of a solution that is 0.8M in HCl and 0.05M of H3PO4

What is the molecular mass of a non-electrolyte solute in a solution that contains 0.6kg of solute and 200g of benzene with a freezing point equal to 5.4°C? The freezing point of pure benzene is 5.53°C/m. The freezing point constant of benzene is 5.12°C.