Mole Concept and Stoichiometry
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basic unit/quantities
mole
of atom/element/compound
mole
avogadro’s number
6.02x10^23
are non-zero digits and any zeroes contained between non-zero digits counted as significant figures
yes
how many significant figures in 300042
6 significant digits
are leading zeroes significant
no
how many significant figures in 0.0000034
2 significant figures
do trailing zeroes count if there is a decimal point
yes
how many significant figures in 0.0002500
4 significant digits
can trailing zeroes count if there is no decimal point
no
how many significant figures in 19000000
2
formula for molar mass
mass(g)/moles (mol)
illustrate the mole map
grade yourself accordingly
Determine the mass (g) of 2.50 moles of Na
57.5g (3 s.f.)
How many moles are present in 50.0g in MgCl2?
0.525 moles
How many Fe atoms are present in 10.0 moles of Fe
6.02𝑥10^24 𝑎𝑡𝑜𝑚𝑠 𝐹𝑒
Calculate the # of molecules present in 25.0g of CH3COOH (acetic acid)
2.51𝑥10^23 𝑚𝑜𝑙𝑒𝑐𝑢𝑙𝑒𝑠 𝑜𝑓 𝐶𝐻3𝐶𝑂𝑂𝐻
Determine the # of Al atoms in 25.0 moles Al2S3
3.01𝑥10^25 𝑎𝑡𝑜𝑚𝑠 𝐴𝑙
2 moles of Na is allowed to react with excess Cl2 to produce NaCl. Determine the # of moles of NaCl formed after the reaction
2 𝑚𝑜𝑙𝑒𝑠 𝑁𝑎𝐶𝑙
What mass (g) of Mg is needed to react with excess oxygen gas to produce 2.0 moles of MgO
48.608𝑔 𝑜𝑓 𝑀𝑔
used to refer to extremely small particles such as atoms, molecules, and ions
mole
SI unit to denote the amount of substance
mole
amount of substance that contains as many elementary particles as in 0.12kg of carbon-12.
mole
experimentally determined value to describe a mole of a pure substance
6.02x10^23