Stoichiometry!

Please note:
- Use 6.022x1023 for avogadro’s number
- Ignore sig figs and do not round the final answer.
- Keep it to 1 decimal place.

a) 13.2 moles

b) 79.33 grams of

Explanation:

First, we'll need to balance the equation

→

There are 2 (O) on the left and only one on the right, so we'll add a 2 coefficient to the right.

→

Now there are 4 (H) on the right and only 2 on the left, so we'll add a 2 coefficient to the () on the left.

→

The equation is now balanced.

a) This can be solved with a simple mole ratio.

4.6 moles × = 13.2 moles

b) This problem is solved the same way!

2.2 moles × = 2.2 moles

However, this problem wants the mass of , not the moles.

The molecular weight of is the weight of 4 (H) molecules and 2 (O) molecules (found on the periodic table). So,

4(1.008) + 2(15.999) = 36.03 g/mol

2.2 moles × = 79.33 grams of

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >