All faculty members are happy to see students each other. dumbledore is particularly with hermione. though, it should be mentioned that students should not simply copy off each other. you will not learn anything that way. snape glares at ron slouches in his chair. snape thinks it’s time for a harder problem. how many milligrams of magnesium reacts with excess hcl to produce 31.2 ml of hydrogen gas at 754 torr and 25.0◦c. the hydrogen is produced by the following reaction:

30.7 mg of Magnesium

Explanation: The equation of reaction is;

Mg(s) + 2HCl(aq) > MgCl2(aq) + H2(g).

I mol of Magnessium produces 1 mol of Hydrogen gas.

Pressure,p= 754 torr, volume, v= 31.2 ml( which is also equals to 0.0312L) , R= 62.36367L torr/kmol, temperature, T = 25 + 273.15)

Step 1: find the number of moles using PV = nRT.

Making n(number of mole) the subject of the formula, we have;

n = PV/RT

Substitute the above parameters into the formula, we have;

n= (754 Torr) x (0.0312 L) / ((62.36367 L torr/K mol) x (25.0 + 273.15) K) = 0.001265 mol of Hydrogen gas.

Step 2: using n = mass/molar mass.

Mass = n × molar mass

(0.001265 mol of H2) x (1 mol Mg / 1 mol H2) x (24.30506 g Mg/mol) = 0.030745 g = 30.7 mg of Magnessium

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

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