Amount of substance and the mole - 3.1 (1) Flashcards
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How are chemicals usually measured?
by mass or volume
As reactions take place on an atomic scale, what do chemists need?
a method for converting a measured mass or volume into the actual number of particles involved in the reactions
What is the name of the quantity that chemists use?
amount of substance n -> to count the number of particles in a substance
What is the name of the quantity that chemists use?
amount of substance n -> to count the number of particles in a substances
What is the name of the unit used for the amount of substance?
mole (mol)
What is one mole the amount of?
a substance that contains 6.02 x 10^23 particles
What is Avogadro’s constant NvA?
6.02 X 10^23mol^-1 -> the number of particles in each mole of carbon-12
What is 6.03 x 10^23 particles per mole directly linked to?
the mass of carbon-12, the standard for the measurement of relative atomic masses
What does 12g of carbon-12 contain?
6.02 x 10^23 atoms
What can you find the mass of one mole (1 mol) of?
atoms of any element - it is the relative atomic mass in grams
One mole of carbon, C, atoms has a mass of?
12.0g
One mole of hydrogen, H, atoms has a mass of?
1.0g
One mole of magnesium, Mg, atoms has a mass of?
24.3g
One mole of iron, Fe, atoms has a mass of?
55.8g
What do you need to find the number of atoms?
the sample of an element and its mass
What is difficult for us to understand the size of?
very large numbers
If 6.02 x 10^23 (1 mol) pennies were shared evenly between all humans on earth, every person could spend how much per hour for their whole life?
£1m every hour
What can the amount of substance and moles refer to?
they can refer to anything, not just atoms
When you work in moles, what is it important to use?
the formula or unambiguous name of a substance for clarity
1 mol of H: 1 mol of what kind element?
hydrogen atoms
1 mol of Hv2: 1 mol of what kind of element’s molecules?
hydrogen molecules
What is the mass of 1 mol of atoms of an element equal to?
the relative atomic mass in grams