Chemistry help!

Anonymous
timer Asked: Oct 21st, 2013
account_balance_wallet $5

Question Description


the density of ethanol (C2H5OH) is 0.789 g/ml at room temperature. how many H atoms are present in 10.56 cubic meter of ethanol at this temperature?

Tutor Answer

duingpung
School: Cornell University

Solution:

Density of ethyl alcohol = mass / volume
Hence,
mass = density * volume
mass = 0.789 g/mL * 200 mL
mass = 157.8 g

Note: volume of solution in above case = 100mL + 100 mL = 200 mL

We know,
Number of moles of ethyl alcohol ( n ) = mass / molecular mass
n = 157.8 / 46
n = 3.43 mol

Note: molecular mass of C2H5OH = 2*12 + 5*1 + 16*1 + 1 = 46 g

Molarity of ethyl alcohol ( M ) = number of moles of ethyl alcohol / total volume (in Litres)
M = 3.43/ 0.2
M = 17.15 g/L

Note: In molarity volume should always be in Litres. Hence, above, Volume = (100 + 100) mL = 200 mL = (200/1000) L = 0.2 L.

flag Report DMCA
Review

Anonymous
Good stuff. Would use again.

Similar Questions
Hot Questions
Related Tags
Study Guides

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors