2H2O = 2H2 +O2 If 30mL of hydrogen are produced in above reaction, how many mL of oxygen are produced? Please show work.

15 mL of O₂.

Explanation:

The balanced equation for the reaction is given below:

2H₂O —> 2H₂ + O₂

From the balanced equation above,

2 mL of H₂O reacted to produce 2 mL of H₂ and 1 mL of O₂.

Next, we shall determine the volume of H₂O needed to produce 30 mL of H₂. This can be obtained as follow:

From the balanced equation above,

2 mL of H₂O reacted to produce 2 mL of H₂.

Therefore, 30 mL of H₂O will also react to produce 30 mL of H₂.

Thus, 30 mL of H₂O is needed for the reaction.

Finally, we shall determine the volume of O₂ produced from the reaction. This can be obtained as follow:

From the balanced equation above,

2 mL of H₂O reacted to produce 1 mL of O₂.

Therefore, 30 mL of H₂O will react to produce = (30 × 1)/2 = 30/2 = 15 mL of O₂.

Thus, 15 mL of O₂ were produced from the reaction.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: