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If excess aluminum metal is reacted with 19 g of chlorine gas and produces 4 g of aluminum chloride, calculate the percent yield of this reaction.

Gaseous ethane (CH3CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O). What is the theoretical yield of carbon dioxide formed from the reaction of 29.5g of ethane and 71.3g of oxygen gas? 

Round your answer to 3 significant figures.

Hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid; Mg(s)+2HCl(aq)-->MgCl2(aq)+H2(g). What is the volume, in liters, of H2 gas produced at 24 degrees C and 835 mmHg, from the reaction of 12.0 g of Mg?

magnesium metal reacts with aqueous hydrochloric acid to form hydrogen gas and aqueous magnesium chloride. Mg(s)+2HCl(aq)=MgCl2(aq)+H2(g)

A student performs this reaction in a laboratory and collects the hydrogen gas over water. The student collects 215.8mL of gas at a pressure of 755.2mmHg and a temperature of 22 degrees C.

(here are some answers I found already correct me if I am wrong)

I found the water pressure at 22 degrees C to be 19.8mmHg

I found the partial pressure of the hydrogen in the tube to be 735.4mmHg or 0.968atm

Using the ideal gas law to calculate moles of hydrogen produced in the reaction I got 0.0086 mol H2.

I need help with these questions.

How many moles of Mg reacted? (assume 100% yield)

What mass of Mg reacted?

A common way to make hydrogen gas in the laboratory is to place a metal such as zinc in
hydrochloric acid. The hydrochloric acid reacts with the metal to produce hydrogen gas, which is then collected over water. Suppose a student carries out this reaction and collects a total of 154.4 mL of gas at a pressure of 742 mmHg and a temperature of 25 oC. What mass of hydrogen gas (in mg) does the student collect?

The following chemical reaction takes place in aqueous solution: ZnSO4 (aq) + 2KOH (aq) → ZnOH2 (s) + K2SO4 (aq)

The following chemical reaction takes place in aqueous solution:

MgNO32 (aq) + 2KOH (aq) → MgOH2 (s) + 2KNO3 (aq)

Write the net ionic equation for this reaction.

The following chemical reaction takes place in aqueous solution: 2AgNO3 (aq) + K2CO3 (aq) → Ag2CO3 (s) + 2KNO3 (aq) Write the net ionic equation for this reaction.