What Is It Meant By Relative Formula Mass Of Nacl
What is it meant by relative formula mass? How is it calculated using the periodic table?
Each element has a relative atomic mass. When a compound is made, these relative atomic masses are added together to calculate the relative formula mass of the substance. For example the atomic mass of Na is 23 and the atomic mass of Cl is 35.5 so the relative formula mass of NaCl is 58.5
How by using RFM is it possible to work out amounts of a substance in terms of moles?
The compound I was using in my experiment was NaOH. The first thing I needed to work out was the number of moles I needed. To do this I used the formula: Number of moles = Mass ÷ RFM.
The mass is the amount that I weighed on the balance which was 1g. I then worked out the RFM of NaOH which is 40. I next put my mass and the RFM into the formula to find out the number of moles. Number of moles = 1 ÷ 40 Number of moles = 0.025 …show more content…
To measure and prepare my standard solution accurately I had to find the correct mass to weigh on the balance. To ensure this I had to work out the number of moles by: Number of moles = Volume × Molarity
250cmᵌ was the volume of my alkali. However I was working in litres therefore my volume turned out to be 0.0250. I also know that my molarity is 0.1 so I can add this into my formula to work out the number of moles. Number of moles = 0.0250 × 0.1 which is 0.0250 moles.
Now I know this I can establish the formula: Number of moles = Mass ÷ RFM
I don’t know the mass yet as this is what I am trying to work out so to do this I need to multiply the number of moles by the RFM. Mass = 0.0250 × 40 =
Each element has a relative atomic mass. When a compound is made, these relative atomic masses are added together to calculate the relative formula mass of the substance. For example the atomic mass of Na is 23 and the atomic mass of Cl is 35.5 so the relative formula mass of NaCl is 58.5
How by using RFM is it possible to work out amounts of a substance in terms of moles?
The compound I was using in my experiment was NaOH. The first thing I needed to work out was the number of moles I needed. To do this I used the formula: Number of moles = Mass ÷ RFM.
The mass is the amount that I weighed on the balance which was 1g. I then worked out the RFM of NaOH which is 40. I next put my mass and the RFM into the formula to find out the number of moles. Number of moles = 1 ÷ 40 Number of moles = 0.025 …show more content…
To measure and prepare my standard solution accurately I had to find the correct mass to weigh on the balance. To ensure this I had to work out the number of moles by: Number of moles = Volume × Molarity
250cmᵌ was the volume of my alkali. However I was working in litres therefore my volume turned out to be 0.0250. I also know that my molarity is 0.1 so I can add this into my formula to work out the number of moles. Number of moles = 0.0250 × 0.1 which is 0.0250 moles.
Now I know this I can establish the formula: Number of moles = Mass ÷ RFM
I don’t know the mass yet as this is what I am trying to work out so to do this I need to multiply the number of moles by the RFM. Mass = 0.0250 × 40 =