# chemistry

posted by .

how many grams of magnesium are required to liberate 250 cm3 of Hydrogen gas from HCL

• chemistry -

Mg + 2HCl ==> H2 + MgCl2
You want 250 cc H2. I assume that's at STP. mols H2 = 250 cc x (1 mol/22,400cc) = ?
Convert mols H2 to mols Mg using the coefficients in the balanced equation.
?mol H2 x (1 mol Mg/1 mol H2) =- ? mol H2 x (1/1) = ? mols Mg.
Now convert mols Mg to grams. g = mols x molar mass.

• chemistry -

The

## Similar Questions

1. ### AP Chemistry

My objective is to find the molar mass of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas?
2. ### chem

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 1.0 M HCl is required to react completely with 4.00 g of magnesium i did 4.00g x (mol/24.31 g Mg) x (2 mol …
3. ### chemistry

Magnesium reacts with HCl to produce magnesium chloride and hydrogen gas. Mg(s)+2HCl(aq)->MgCl2(aq)+H2(g). What is the molarity of the HCl solution if 330 ml of the HCl solution reacts with magnesium to produce 7.40 L of H2 gas …
4. ### Chemistry

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 9.0 M HCl is required to react completely with 5.00 g of magnesium?
5. ### chemistry

How many liters of 0.250 M HCl would be required to react completely with 7.50 grams of magnesium hydroxide?
6. ### chemistry

5.0g of magnesium metal reacted with 1000cm3 of 4.5M of HCl solution to produce hydrogen gas. Calculate the amount of HCl left and the number of hydrogen molecules produced
7. ### chemistry

5.0g of magnesium metal reacted with 1000cm3 of 4.5M of HCl solution to produce hydrogen gas. Calculate the amount of HCl left and the number of hydrogen molecules produced
8. ### Chemistry;HELP

Volume Problems Answer the following questions. Scan and upload your questions and answers to your student section labeled Volume Volume Problems. Identify the following chemical equations by type. 1. If an electric discharge produces …
9. ### chemistry

What volume of hcl solution of density 1.2g/cm3 and containing 36.5% by weight hcl, must be allowed to react with zinc in order to liberate 4g of hydrogen The answer 333.3ml Who helps me step by step for me
10. ### Chemistry

Identify the following chemical equations by type. 1. If an electric discharge produces 800 cm3 of ozone (O3), how many cm3 of oxygen (O2) are required?

More Similar Questions