Fe2O3 + 3C → 2Fe + 3CO; how many grams of C are needed to react with 16.5 g Fe2O3? Chemistry Assignment Homework Help

1. In the following reaction:  Fe2O3 + 3C → 2Fe + 3CO;how many grams of C are needed to react with 16.5 g Fe2O3?

2. Give an example of a physical change and chemicalchange.

3.  A sampleof nitrogen (N2) has a volume of 50.0 L at a pressure of 760 mmHg.What is the volume of the gas when the pressure changes to 1500 mmHg if thereis no change in temperature.

4. Calculate the molarity (M) of 4.0 g of KOH in 2.0L of solution.

5.  Indicate whetherthe following solutions are acidic, basic or neutral.

  a. [H3O+]= 6.0 x 10-12 M

  b. [H3O+]= 1.4 x 10-4 M