Calculatethemassof3.011×1023Natoms.
Numberofmoles(n)=Givennumberofparticles(N)Avogadro'snumber(NA)n=3.011×1023atoms6.022×1023atomsmol-1n=0.5molem=n×Mm=0.5mol×14g/molm=7gTherefore,massof3.011×1023Natomsis7g.
Consider a 70% efficient hydrogen-oxygen cell working under the standard condition at 1bar and 298K. Its cell reaction is
H2g+12O2g→H2Ol
The work derived from the cell on the consumption of 1.0×10-3molofH2(g) is used to compress 1.00mol of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas?
The standard reduction potentials for the two half-cells are given below
O2g+4H+aq+4e-→2H2Ol, E0 = 1.23V
2H+aq+2e-→H2g, E0 = 0.00V
Use F=96500Cmol-1, R=8.314Jmol-1K-1.