calvulating mr Flashcards
What does mr (rfm) stand for in chemistry?
Mr (rfm) stands for relative formula mass.
How is mr calculated?
Mr is calculated by adding up the relative atomic masses of all the atoms in a formula.
What is the unit of mr?
The unit of mr is grams per mole (g/mol).
What is the relative atomic mass of hydrogen?
The relative atomic mass of hydrogen is 1.
What is the relative atomic mass of oxygen?
The relative atomic mass of oxygen is 16.
Calculate the mr of H2O.
The mr of H2O is 18 (21 + 116).
What is the mr of CO2?
The mr of CO2 is 44 (112 + 216).
What is the mr of NaCl?
The mr of NaCl is 58.5 (23 + 35.5).
True or False: Mr is always a whole number.
False. Mr can be a decimal number in cases of isotopes or percentage compositions.
What is the mr of a compound if all atoms are isotopes?
The mr will be a decimal number due to the presence of isotopes.
What is the mr of a compound if it contains a mixture of isotopes?
The mr will be a weighted average of the isotopic masses.
What does the mr of a compound allow us to calculate?
The mr allows us to calculate the mass of a given number of moles of a substance.
What is the formula to calculate the number of moles of a substance?
Number of moles = Mass (g) / Mr.
What is the relationship between moles, mass, and mr?
Moles = Mass / Mr, Mass = Moles * Mr, Mr = Mass / Moles.
What is the mr of a compound if one of the atoms is an isotope?
The mr will be a decimal number due to the presence of the isotope.
What is the mr of a compound if it contains a mixture of isotopes and one regular atom?
The mr will be a weighted average of the isotopic masses and the regular atom.
What is the mr of a compound if it contains a polyatomic ion?
The mr will be the sum of the relative atomic masses of all atoms in the ion.
What is the mr of a compound if it contains a transition metal?
The mr will be calculated based on the charge of the transition metal.
What is the mr of a compound if it contains a polyatomic molecule?
The mr will be the sum of the relative atomic masses of all atoms in the molecule.
What is the mr of a compound if it contains a hydrate?
The mr will include the mass of the water molecules in addition to the compound.
What is the mr of a compound if it contains a coordination complex?
The mr will be calculated based on the coordination number and charges of the ligands and central metal.
How can mr be used in stoichiometry calculations?
Mr can be used to determine the mass of reactants and products in a chemical reaction.
What is the significance of calculating mr in chemistry?
Calculating mr helps in determining the composition, structure, and properties of compounds.
What is the mr of a compound if it contains a radioactive isotope?
The mr will be a decimal number due to the presence of the radioactive isotope.
