The Mole and Molar mass

[Christiano]

I need help with another one:

I have sucrose (C12 H22 O11) and its mass in grams is 8.546, from this:

What is the (i) relevant formula and (ii) solution for:

a) Total amount, in mol, of atoms in the sample.

b) Total number of atoms in the sample.

I've got it worked out, but I'm not sure its correct and my brain is fried from doing these calculations.

[Christiano]

Little tip, if you use calculator in class to do quick stoich questions, then I suggest defining a variable as Avogadro's number.
It saves me heaps of time!

You mean like N
                      A ?

[m@tty]

Store as a variable, so it only takes one button.

[Christiano]

Ohh, can you do that on a scientific or CAS? How do store it and use it as a shortcut?

[the.watchman]

Store as a variable, so it only takes one button.

Yep, that's the easiest

Ok:

(a) (i)

(ii)

(b) (i)

(ii)

[the.watchman]

Ohh, can you do that on a scientific or CAS? How do store it and use it as a shortcut?

For scientific, there are different ways
For CAS, just store it as whatever you like, I have it as 'na'

[Christiano]

Store as a variable, so it only takes one button.

Yep, that's the easiest

Ok:

(a) (i)

(ii)

(b) (i)

(ii)

+1 THANKS A LOT :D

[the.watchman]

No prob, I just spent 2.5 hrs last night doing Yr 11+12 stoich questions, I'm avocadoed out!

[ttn]

Store as a variable, so it only takes one button.

How would we go about doing this?

[m@tty]

Depends what calculator. For a scientific one like mine, you enter the number then press store (normally "sto" with and arrow) and then select the variable you want to store it in, for example "x" and press enter. Now every time you enter "x" into an equation it will see .

[ttn]

Awesome, it worked. Thanks a lot