Question

My Lab Notes

I added 10 mL of water to the flask.
I added 10 mL of hydrochloric acid to the flask.
I closed the flask.
The temperature was 21.5.
The pressure was 1.00.
The volume of the liquid is 20, so the gas is 130.
I put .1 g of magnesium into flask.
The pressure went to 1.83 and dropped to 1.76.
The temperature went to 34.7 and dropped to 21.6
The volume of the gas is 130.1.
After inserting the gas syringe, the volume of the gas in the syringe was 99.5.
The new temperature was 21.5.
The new pressure was 1.00.
The final liquid volume in the flask is 19.9.

Questions:

1. The official molar mass of magnesium is 24.305 g/mol. Based on the number of grams of magnesium added, how many moles of magnesium were consumed? Choose the closest answer

A. 0.00411

B. 0.0411

C 0.0621

D. 0.00621

2. How many moles of hydrochloric acid were added to the flask? To calculate the number of moles of HCl, use the formula below. Choose the closest answer.
n = M × V
where n is the number of moles, M is the molarity of the solution, and V is the volume of the solution in L.

A.0.01 mol

B.0.03 mol

C.0.003 mol

D.0.06 mol

3. What is the limiting reagent for the reaction?

A.magnesium chloride

B.hydrochloric acid

C.magnesium

D.hydrogen

.