Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride

The volume of H2 is 1.117 L

Explanation:

Step 1: Data given

Temperature of H2 = 273 K

Pressure of H2 = 2.00 atm

Molarity of HCl = 0.725 M HCl

Volume of HCl = 275 mL = 0.275 L

Mg is in excess

Step 2: The balanced eqquation

Mg + 2HCl → MgCl2 + H2

Step 3: Calculate moles HCl

Moles HCl = molarity * volume

Moles HCl = 0.725 M * 0.275 L

Moles HCl = 0.199375 moles

Step 4: Calculate moles H2

For 1 mol Mg we need 2 mole HCl to produce 1 mol MgCl2 and 1 mol H2

For 0.199375 moles HCl we'll have 0.199375/2 = 0.0996875 moles H2

Step 5: Calculate volume H2

p*V = n*R*T

⇒with p = the pressure of H2 = 2.0 atm

⇒with V = the volume of H2 = TO BE DETERMINED

⇒with n = the moles of H2 = 0.0996875 moles

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 273 K

V = (n*R*T) / p

V = (0.0996875 * 0.08206 * 273) / 2.0

V = 1.117 L

The volume of H2 is 1.117 L

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

16

explanation:

the marks go by 4s