A sample of 5.0 g of hydrogen gas reacts with 5.0 g of oxygen gas. 2H2(g) + O2(g) > 2H2O

Please answer the questions in a b c d and e, or at least in any of the ones you know. Thank you.

The percent yield of the reaction has been 74.47%.

The balanced chemical equation for the reaction has been:

(a) The theoretical yield can be calculated as:

The theoretical yield of water has been:

1 mole of oxygen produces = 2 moles of water

0.1562 moles of oxygen produces = 0.1562 2

= 0.312 moles of water.

The mass of water has been = moles molecular weight

The theoretical yield of water = 0.312 18 grams

The theoretical yield of water = 5.616 grams.

(b) The limiting reactant has been the one whose concentration has been in a lesser quantity for the complete utilization of other reactants.

According to the reaction, for the complete utilization of 2 moles of Hydrogen, 1 mole of oxygen has been used.

The moles of 5 grams Hydrogen:

Moles =

Moles of hydrogen =

Moles of hydrogen = 5 mol.

Moles of Oxygen =

Moles of oxygen = 0.1562 mol.

For the complete utilization of 5 moles of hydrogen 2.5 moles of oxygen has been required.

Since the oxygen has been present in a lesser quantity, the oxygen has been the limiting reactant.

(c) The consumption of 0.1562 moles of Oxygen has required 0.312 mol of Hydrogen. The hydrogen has been present in a higher quantity than required.

Thus. hydrogen has been the excess reactant.

(d) The remained excess reactant has been:

Remained = Total - consumed

Remained = 5 - 0.312

Remained = 4.68 mol.

The excess reactant has been 4.68 mol extra than required.

(e) The theoretical yield of water has been:

1 mole of oxygen produces = 2 moles of water

0.1562 moles of oxygen produces = 0.1562 2

= 0.312 moles of water.

The mass of water has been = moles molecular weight

The theoretical yield of water = 0.312 18 grams

The theoretical yield of water = 5.616 grams.

The actual yield of water has been 4.2 grams.

The percent yield of water =

The percent yield of water =

The percent yield of water = 74.74 %

For more information about the limiting reactant, refer to the link:

link

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.