Question

how many atoms are there in .250 mole of C3H8

Answer 1

multiply by Avogadro number, it is a simple conversion

1mol = avagadros number

thus

(avagardos number (atoms)/1mol)(0.250mol) = # of atoms

Answer 2

notice mol cancels out and you are left with the unit atoms

Answer 3

thanks

Answer 4

\(N_A\frac{[\text{molecules}] }{[\text {mol}]}=\) avogadro's number of molecules

\[ {N_A\frac{[\text{molecules}] }{[\text {mol}]}}\times0.250[\text {mol}][C_3H_8] =\# [\text{molecules}][C_3H_8] \]

each molecule has Three carbon atoms and Eight Hydrogen atoms
\[\frac{[\text{atoms}]}{ [\text{molecule}][C_3H_8] } =11\]

\[\#[\text{molecules}][C_3H_8]* \frac{[\text{atoms}]}{ [\text{molecule}][C_3H_8] }= \# [ \text{atoms}] \]