Each molecule of hydrochloric acid, hcl, contains one atom of hydrogen and
a. one atom of chlorine.
b. one atom of oxygen.
c. two atoms of chlorine.
d. two atoms of oxygen.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante