A 42-L Flask of Ideal Neon Gas (Which Is Monatomic) Is

Multiple Choice

A 4.2-L flask of ideal neon gas (which is monatomic) is at a pressure of 3.3 atm and a temperature of 450 K. The atomic mass of neon is 20.2 g/mol. How many neon atoms are in the flask? $( R = 8.31$ $\left. \mathrm { J } / \mathrm { mol } \cdot \mathrm { K } , 1 \mathrm {~atm} = 101 \mathrm { kPa } , N _ { \mathrm { A } } = 6.022 \times 10 ^ { 23 } \mathrm { molecules } / \mathrm { mol } \right)$

A) $2.3 \times 10^{22}$
B) $6.9 \times 10^{22}$
C) $2.3 \times 10 ^ { 25 }$
D) $6.9 \times 10^{23}$
E) $2.3 \times 10 ^ { 23 }$