promotion image of download ymail app
Promoted
RABI asked in Science & MathematicsChemistry · 10 months ago

Please provide me the solution of only Numerical part?

Attachment image

2 Answers

Relevance
  • 10 months ago

    Find the molar mass ....

    PV = nRT ............... ideal gas equation

    PV = mRT / M ........ n=m/M .... m=mass, M=molar mass

    M = mRT / (PV) ..... solve for molar mass

    M = 2.8g x 0.08206 Latm/molK x 400.K / 1.00 atm / 1.00L

    M = 91.9 g/mol .... round to 92 g/mol

    CxHy .....

    12.0x + 1.01y = 92 g/mol

    Mass ratio C:H = 10.5g:1g

    Convert to moles to get the empirical formula

    10.5g C x (1 mol C / 12.0gC) = 0.875 mol H / 0.875 = 1 mol C x 7 = 7 mol C

    1.0g H x (1 mol H / 1.0g H) = 1.0 mol H / 0.875 = 1.14 mol H x 7 = 8 mol H

    Empirical formula = C7H8

    Empirical molar mass = 92 g/mol

    The actual molar mass is 92 g/mol

    Therefore, the molecular formula is the empirical formula.

    • Commenter avatarLogin to reply the answers
  • 10 months ago

    i dont know man

    • Dr W
      Lv 7
      10 months agoReport

      just killing time then man?

    • Commenter avatarLogin to reply the answers
Still have questions? Get your answers by asking now.