Calculate the molar mass of the following substance: Sulphur molecule, S8 . Note that rounding errors may occur, so always check the results. moles S8 = 16 g / 256 g/mol=0.0625. Calculate the number of aluminium ions present in 0.051 g of aluminium oxide. 1 grams Sulfur is equal to 0.031186652112896 mole. Important Solutions 1. Chemically, sulfur combines with all elements except for gold, platinum, iridium, nitrogen, tellurium, iodine and the noble gases. The molar mass of S8 = 256.52g S8. Textbook Solutions 8950. Therefore, 16 g of S 8 contains 3.76 x 10 22 molecules. (a) Molar mass of S 8 = 256 g mol-1 We know, 1 mole of S 8 = Molar mass of S8 = 6.022 x 10 23 molecules 256 g of S 8 = 6.022 x 10 23 molecules. (a) Ethyne, C2H2 (b) Sulphur molecule, S8 (c) Phosphorus molecule, P4 (Atomic mass of phosphorus = 31) (d) Hydrochloric […] NCERT Solutions for Class 9 Science Chapter 3 Atoms And Molecules NCERT Books for Session 2020-2021 CBSE Board and UP Board Exercises Questions Page No-44 Questions No- 6 Calculate the molar mass of the following substances. molecules S8 = 0.0625 x 6.02 x 10^23 =3.76 x 10^22 i.e., 256 g of solid sulphur contains = 6.022 x 10 23 molecules Then, 16 g of solid sulphur contains =6.022 x 10 23 / 256 = 16 molecules = 3.76375 x 10 22 molecules. molecular weight of Sulfur or mol The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. Sulfur (S - Standard atomic weight), molar mass. Answer: 1 on a question Calculate the molar mass of the following substances: (a) Ethyne, C₂H₂ (b) Sulphur molecule, S₈ (c) Nitric acid, HNO₃ - the answers to smartanswers-in.com molar mass S8 =256 g/mol. CBSE CBSE Class 9. (a) Ethylene, C2H2 = 2 x 12 + 2 x 1 = 26 u (b) Sulphur molecule, S8 = 8 x 32 = 256 u (c) Phosphorus molecule, P4 = 4 x 31 = 124 u (d) Hydrochloric acid, HCl = 1 x 1 + 1 x 35.5 = 36.5 u (e) Nitric acid, HNO3 = 1 x 1 + 1 x 14 + 3 x 16 = 63 u Calculate the molar mass of the following substances: (a) Ethyne, C2H2 (b) Sulphur molecule, S8 asked Nov 4, 2017 in Chemistry by jisu zahaan ( 29.7k points) atoms and molecules Sulfur or sulphur is a chemical element with symbol S and atomic number 16. Advertisement Remove all ads. Therefore, 16 g of S 8 contains 3.76 x 10 22 molecules. Use this page to learn how to convert between grams Sulfur … Question Bank Solutions 7867. Atomic mass of Al = 27 u) Elemental sulfur is a bright yellow crystalline solid at room temperature. (Hint: The mass of an ion is the same as that of an atom of the same element. (b) Molar mass of water (H 2 O) = (2 x atomic mass of H) + (1 x atomic mass of O) The molar mass of S8 = 256 gmol-1. (a) Molar mass of ethyne, C2H2 = 2 x 12 + 2 x 1 = 26 g (b) Molar mass of sulphur molecule, S8 = 8 x 32 = 256 g (c) Molar mass of phosphorus molecule, P4 = 4 x 31 = 124 g (d) Molar mass of hydrochloric acid, HCl = 1 + 35.5 = 36.5 g (e) Molar mass of nitric acid, HNO3 = 1 + 14 + 3 x 16 = 63 g A sulfur molecule has the formula S8. Concept Notes & Videos 296. Syllabus. Multiply the number of sulfur atoms (8) times the atomic weight of sulfur in grams (32.065g). Answer: Molar mass of S8 sulphur = 256 g = 6.022 x 1023 molecule Given mass of sulphur = 16 g Question 11.