What are the cellulose and ligin are changed int other substances

Which 4 elements make up the bulk of living matter?

Hitman42 [59]

"Let's start with the basics: you have probably heard that your body is 90% (or 85% or 95%) water. In actual fact, water is (probably--unless you are obese) the majority of your body weight--but nowhere near 90%. The best estimate I have seen is 57% (Body water). So that puts hydrogen and oxygen in the top four.

As I mentioned, extremely obese people can be less than 50% water. Fat (triglycerides) is composed of carbon, hydrogen, and oxygen. The majority of the mass of a triglyceride is carbon--chemically it is closely related to biodiesel. So that puts carbon in the top four.

Finally, amino acids which make up proteins (which make up muscle) require nitrogen. That makes the top four.: Oxygen, Carbon, Hydrogen, and Nitrogen.

But wait! What about bones? Aren't they calcium and phosphorous? Bones are really heavy.

It turns out that calcium and phosphorous are indeed the next two most abundant (by mass) elements in the body, but where nitrogen is about 3% of your body mass, calcium and phosphorous are 1.5% and 1.2% respectively.

You can find the full breakdown of the elemental composition of your body here: Abundance of the chemical elements"

4 0

3 years ago

Aqueous hydrochloric acid HCl reacts with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H

allochka39001 [22]

Answer : The theoretical yield of water formed from the reaction is 0.54 grams.

Solution : Given,

Mass of HCl = 1.1 g

Mass of NaOH = 2.1 g

Molar mass of HCl = 36.5 g/mole

Molar mass of NaOH = 40 g/mole

Molar mass of $H_2O$ = 18 g/mole

First we have to calculate the moles of HCl and NaOH.

$\text{ Moles of }HCl=\frac{\text{ Mass of }HCl}{\text{ Molar mass of }HCl}=\frac{1.1g}{36.5g/mole}=0.030moles$

$\text{ Moles of }NaOH=\frac{\text{ Mass of }NaOH}{\text{ Molar mass of }NaOH}=\frac{2.1g}{40g/mole}=0.525moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$HCl+NaOH\rightarrow NaCl+H_2O$

From the balanced reaction we conclude that

As, 1 mole of HCl react with 1 mole of NaOH

So, 0.030 mole of HCl react with 0.030 mole of NaOH

From this we conclude that, $NaOH$ is an excess reagent because the given moles are greater than the required moles and $HCl$ is a limiting reagent and it limits the formation of product.