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Essay About History and Evolution of Computers

In: Computers and Technology

Submitted By esddd
Words 597
Pages 3
Universal Gas Constant * What are the four measurable properties of gases?

Temperature, volume, moles, pressure.

* R is the universal gas constant that relate the four properties of gases in one relationship. Write down the formula equal to R. PV = R nT * What is the unit that you used for R?

Atm.L\k.mol

* Hydrogen gas has properties very nearly like an ideal gas. Write down the equation for the production of H2 gas
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)

* In our experiment, the total pressure of the gas was calculated by adding P(hydrogen) and P(water vapor). Where did the water vapor come from? * The H2 is collected over water bath * There is also some water vapor * Pressure of H2 is different than that of H2O

* Explain how did you measure the following properties of H2 gas:

Temperature of H2 | thermometer | Volume of H2 | HCl in the burette we Invert burette into beaker thwn we read it from the beurette | Moles of H2 | n = m/M |

* A burette which contains 0.001 moles of Mg metal and HCl solution, was inverted in water bath of 300 kelvin. The reaction produces 0.025 L of hydrogen gas with a total pressure of 1 atm. Calculate the gas constant of H2.

R= PVnT = 1 × 0.0250.001 × 300 = 0.0833 atm.L\k.mol

* A 0.614 mole sample of ideal gas at 12 °C occupies a volume of 4.3 L. What is the pressure of the gas? (R = 0.0821 L.atm/mol.K)

12 °C+273.15=285.15 k
P= R n TV= 0.0821 × 0.614 × 285.154.3 = 3.3428 atm Determine the volume occupied by 0.001 moles of H2 gas at a temperature of 298K and a pressure of 1 atm. (R = 0.0821 L.atm/mol.K)

V = R n TP = 0.001 × 298 × 0.08211 = 0.0244 L

* A sample of H2 gas, at a temperature of 303K and a pressure of 1 atm, occupies 22.2 liters. Determine the mass of H2 gas. (molar mass of H = 1) (R

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