Platinum is used to catalyze the hydrogenation of ethylene: h2(g)+ch2ch2(g)−⟶pt(s)ch3ch3(g) chlorofluorocarbons (cfcs) catalyze the conversion of ozone (o3) to oxygen gas (o2): 2o3(g)−⟶cfc(g)3o2(g) magnesium catalyzes the disproportionation of hydrogen peroxide to produce water and oxygen: 2h2o2(aq)−⟶mg(s)2h2o(l)+o2(g) what type of catalysts are platinum, cfcs, and magnesium under these conditions? drag the appropriate items to their respective bins.

Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction. Catalysts are classified as homogeneous ( same state as the reactants ) or heterogeneous (different state as the reactants). Platinum would be a heterogeneous catalyst. CFCs would be a homogeneous catalyst. Magnesium would be a heterogeneous catalyst.

To Find :

How many moles of air are there in a 125 mL Erlenmeyer flask if the pressure is 755  mm Hg and the temperature is 20.0°C .

Solution :

Since, air contains different gas in different proportion.

Its average molar mass is considered to be 29 gram/mol .

Now, we know by ideal gas equation :

Here, R is ideal gas equation,

Putting all given values we get :

Hence, this is the required solution.