Multiple choice, pick the correct answer

How many phosphate ions, PO4^3- are in 3.58 mol of calcium phosphate, Ca3(PO₄)₂

A. 6.02 X 10²³

B. 4.31 x 10²⁴

C. 2.16 x10²⁴

D. 1.72 x 10²⁵

E. 28.64

2. Match each letter to the correct number

A. Based on a balanced chemical reaction, the relationship between the products water and oxygen can be expressed in this way

B. A piece of sodium metal is added to water it reacts violently. When the reaction is over, only a clear liquid remains in the beaker. The Sodium is an example of this.

C. A student carries out a reaction and measures the mass of the product at 1.23g

D. In the reaction of gasoline with oxygen in a car fuel tank, oxygen in a car's fuel tank, oxygen is an example of this

E. An engineering technician determines that a step in a chemical process has an efficiency of 89%

1. excess reactant

2. mole ratio

3. limiting reactant

4. actual yield

5. percentage yield

6. theoretical yield

7. experimental error

3. Your friend tells you that a decomposition reaction does not have any excess reactants do you agree or disagree? explain your answer using an example

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2mol of H20 Imol 02