Breads and other whole grain foods are composed of very large polysaccharide molecules which contain hydrogen, oxygen, and which other element?A) carbonB) ironC) nitrogenD) water

A

Explanation:

Carbohydrates are a class of of food that contains three chemical elements. All carbohydrates consist of the elements carbon, hydrogen and oxygen. These there elements form the building blocks for the carbohydrates class.

In fact, the chemical formula of carbohydrates is written in a way such that these three elements are the only elements present in a molecule of a particular carbohydrate

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2