Is a instant cold pack Endothermic or Exothermic reaction? Explain.
1 answer:
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1) Write the chemical equation.
2) List the known and unknown quantities.
Sample: CH4.
Volume: 2.0 L.
Temperature: 30 ºC = 303.15 K.
Pressure: 3.0 atm.
Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1).
Moles: <em>unknown</em>.
3) Moles of CH4.
<em>3.1- Set the equation.</em>
<em>3.2- Plug in the known values and solve for n (moles).</em>
4) Moles of oxygen that reacted.
The molar ratio between CH4 and O2 is 1 mol CH4: 2 mol O2.
5) Volume of oxygen required.
Sample: O2.
Moles: 0.48 mol.
Temperature: 30 ºC = 303.15 K.
Pressure: 3.0 atm.
Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1).
Volume: <em>unknown</em>.
<em>5.1- Set the equation.</em>
<em>5.2- Plug in the known values and solve for V (liters).</em>
3.98 L of O2<em> is required to react with 2.0 L CH4.</em>
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