Hydrogen peroxide, H2O2 , is used on the skin to prevent infection. Explain why hydrogen peroxide is not 50% hydrogen by mass.

5.88%

Explanation:

hydrogen contribute only 2 by mass which is not even up to half the molecular mass of H2O2 which is 34 hence not 50% by mass.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.