Question

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the...

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 ∘C and 752 torr, the volume is found to be 325 mL . The vapor pressure of water at 29 ∘C is 30.0 torr.

How many moles of H2 can be produced from x grams of Mg in magnesium-aluminum alloy? The molar mass of Mg is 24.31 g/mol.

Express your answer in terms of x to four decimal places (i.e., 0.5000x).

How many moles of H2 can be produced from y grams of Al in magnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.

Express your answer in terms of y to four decimal places (i.e., 0.5000y).

Homework Answers

Answer #1

No. of moles of H2 is 0.0132

The equations of reaction are:

Mg +2 HCl --> MgCl2 + H2
2 Al + 6 HCl --> 2 AlCl3 + 3 H2

Atomic mass of Mg is 24.31 g/mol and of Al = 26.98 g/mol.
If all of the alloy was Al, we have to calculate the mass of Al = 2/3*mol[H2]*26.98 g/mol = 237.4240 mg
If it all was Mg we calculate mol[H2]*24.31= 320.8920 mg
If Al is 85.5 % and Mg 14.5 % the alloy produces the amount of H2 given.

At first we have to calculate the gas volume at standard condition (25°C and 760 torr)

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the...
A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 ∘C and 752 torr, the volume is found to be 345 mL . The vapor pressure of water at 29 ∘C is 30.0 torr. A) How many moles of H2 can be produced from x grams of Mg in magnesium-aluminum alloy? The molar mass of Mg is 24.31 g/mol. B) How many moles of H2 can...
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Consider the above unbalanced equation. A 1.00 g sample of...
Al(s) + HCl(aq) AlCl3(aq) + H2(g) Consider the above unbalanced equation. A 1.00 g sample of a copper-aluminum alloy is reacted with excess hydrochloric acid. Only the aluminum reacts. The H2 produced is collected by displacement of water. If 110. mL of H2 is collected at a barometric pressure of 725 mm Hg and 25.0°C, what is the mass percent of Al in the sample? The vapor pressure of water is 23.8 mm Hg at 25.0°C. Use molar masses with...
a particular sample of a zinc-aluminum alloy weighs 3.00 g and has mass percentages of 72.5%...
a particular sample of a zinc-aluminum alloy weighs 3.00 g and has mass percentages of 72.5% Zn and 27.5% Aluminum. a) How many moles of each element is in the alloy sample? b) How many theoretical moles of H2(g) will be produced by the reaction of HCl (aq) with each metal and what will be the total number of moles produced? c) How many actual moles of H2(g) will be produced by the reaction of HCl (aq) with each metal...
a particular sample of zinc-aluminum alloy weighs 3.00 g and has mass percentages of 73.5% Zn...
a particular sample of zinc-aluminum alloy weighs 3.00 g and has mass percentages of 73.5% Zn and 26.5% Al. a. how many moles of each element is in the alloy sample? b. how many theoretical moles of H2 (g) will be produced by the reaction of HCl aq with each metal and what will be the total number of moles produced?
Information: In this experiment, you will fill a gelatin capsule with an alloy sample. If the...
Information: In this experiment, you will fill a gelatin capsule with an alloy sample. If the mass of the gelatin capsule is 0.123 g, and the mass of the capsule plus alloy sample is 0.215 g, calculate the mass, in grams, of the alloy sample. - 0.092 g The alloy sample is dissolved in HCl and H2 gas is produced and collected over water. The volume of H2 gas produced is 89.5 mL. What is the volume of gas, in...
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve...
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 15.3 g . Part A: What minimum mass of H2SO4 would you need? Express your answer in grams. Part B: What mass of H2 gas would be produced by the complete reaction of the aluminum block? Express your answer in grams.
!. What are the coefficients for this equation so that it balances? HCl(aq) + Al(s)------ H2(g)...
!. What are the coefficients for this equation so that it balances? HCl(aq) + Al(s)------ H2(g) + AlCl3(aq); (Hint- the coefficient add to 13).Just write your answer separated by commas(for example 2,1,4,6) 2. If someone measures out 2.75g of magnesium solid, how many moles is this? In order to answer, yo will need to use the molar mass given in the periodic table. 3. Whic is limiting H2(g) or O2(g)?How much water actually forms?
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve...
Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.5 g . Part A What minimum mass of H2SO4 would you need? I got 79.1 g, which is correct. Part B What mass of H2 gas would be produced by the complete reaction of the aluminum block? Express your answer in grams.
How many moles of oxygen, O, are there in 479.07 g of iron (III) oxide, Fe2O3?...
How many moles of oxygen, O, are there in 479.07 g of iron (III) oxide, Fe2O3? Molar mass of Fe2O3 is 159.69 g/mol. 9.00 MOL 3.00 MOL 1.00 MOL 0.333 MOL From the Balanced Chemical Equation: 4 Al + 3O2 --> 2 Al2O3 Apply Stoichiometry to determine the yield (grams) of Al2O3 produced if you start with 108 grams of Al in excess O2 as reactants. Aluminum is the limiting reactant, and oxygen is present in excess. The formula weight...
A weather balloon contains 222 L of He gas at 20. °C and 760. mmHg. What...
A weather balloon contains 222 L of He gas at 20. °C and 760. mmHg. What is the volume of the balloon when it ascends to an altitude where the temperature is -40. °C and 540. mmHg? 1 What volume does 12.5 g of Ar gas at a pressure of 1.05 atm and a temperature of 322 K occupy? Would the volume be different if the sample were 12.5 g of He gas under the same conditions? How many moles...