C5 Formulas 0.0 / 5 ? ScienceChemistryGCSEOCR Created by: IsabelmilsomCreated on: 06-05-16 12:59 What is the formula for the number of moles in a given mass? Mass in g (of element or compound)/Mr (of element or compound) 1 of 8 What is the formula for concentration (in mol/dm cubed)? No. of moles/volume (in dm cubed) 2 of 8 What is the formula for percentage composition by mass of compounds? Ar x No. of atoms (of that element)/Mr (of whole compound) x 100 3 of 8 What is the formula for the No. of moles? Mass (in g)/relative formula mass 4 of 8 how do you convert moles per dm cubed into grams per dm cubed? Mass (in g) = No. of moles x relative formula mass 5 of 8 How do you use the sodium content to estimate the mass of salt present? Amount of sodium x ratio of sodium chloride's Mr to sodium's Ar (58.5/23) 6 of 8 How do you find the volume of a gas at RTP? Volume (dm cubed) = moles of gas x 24 7 of 8 what is 1dm cubed in cm cubed? 1000cm cubed 8 of 8

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