Chapter 3 Flashcards
What is the relative molecular mass?
Is the weighted mean mass for one molecule of a substance relative to 1/12 of the mass of a carbon-12.
Give an example for relative molecular mass for glucose?
C6H12O6
Is relative formula mass the same as relative molecular mass?
Yes
What is the amount of substance?
It is the number of particles in a substance in a mole.
What is Avogadro substance?
It is the number of particles contained in 12g of carbon-12- 6.02 x 10 to power of 23
What is the molar mass?
The mass, in grams, of 1 mole of atoms of an element is equal to its relative atomic mass.
What is the molar gas volume?
Is the volume of 1 mole of gas given at a temperature and pressure.
What are the standard conditions?
25 degrees and 1 ATM
What is the equation for mass using molar mass and moles?
Moles (n) = mass(g) /molar mass (Mr)
What is an empirical formula?
Shows the simplest whole-number ratio of atoms in a compound.
Example of empirical formula for glucose?
CH2O
What is molecular formula?
Is the number of atoms of each element in a molecule.
Example of molecular formula for glucose?
C6H12O6
What are the steps to determine formula for hydrated salts?
- Mole of anhydrous salt - mass of salt/ Mr of salt
- Mole of water removed with heating - mass of water removed/ Mr of water (18)
- Ratio of water to salt
What is an anhydrous compound?
Is one that contains no water molecules
What is hydrated mean?
When water is part of the crystalline structure of a substance
What does water of crystalline mean?
The water that is part of the solid salt crystal.
How to work out chemical formulae?
- mass (g)
- molar mass
- no of moles - mass/molar mass
- Ratio of elements
- Simplest whole ratio
What is the equation for gas volume, involving amount of substance?
What happens when volume is in dm3?
What happens when volume is in cm3?
amount= volume/ molar gas volume
n(dm3)/ 24
n(cm3)/24000
What is the equation for substance, involving gas volume?
PV=NRT
What is the units for PV=NRT?
P- pressure (pa) V-volume (m3) N- moles (mol) R- gas constant (8.315) T- temperature (K)
How to convert cm3 to m3?
x10 to power of -6
How to convert dm3 to m3?
x10 to power of -3
How to convert degrees to kelvin?
+273