What is the percent by mass of hydrogen in
glucose?

Hello!

Let's first look at glucose's molecular formula. This shows which atoms are in the molecule. Glucose's formula is C6H12O6. This means it has 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Now, you're looking for percent by mass. This means that we need to find the mass of the hydrogen atoms and the mass of the entire molecule. To do this, first find the atomic mass for each of the atoms in glucose.

Carbon's amu: 12.011

Hydrogen's amu: 1.008

Oxygen's amu: 15.999

Now, find the atomic mass for the entire molecule. To do this, multiply the amu's with the respective number of atoms, then add them all together.

Carbon: 6 atoms * 12.011 = 72.066

Hydrogen: 12 atoms * 1.008 = 12.096 (important for later)

Oxygen: 6 atoms * 15.999 = 95.994

Add them together: 72.066 + 12.096 + 95.994 = 180.156 amu for one glucose molecule.

We already know how much all the atoms of hydrogen weigh, as we did that when finding the weight of the glucose molecule. Restating it, it is 12.096.

Now, divide the mass of the hydrogen by that of glucose.

12.096 / 180.156 = 0.0671418104 = 6.714%

Therefore, your final answer is 6.714%.

Hope this helps!

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.