Calculate the density, in grams per liter, of hydrogen sulfide gas, h2s, at 56oc and 967 mmhg. [1] g/l

PV= (m/M)*RT

PVM/RT = m
m/V = PM/RT
m/V = D - density

D= PM/RT

P=967 mmHg
T= 56⁰C+273=329K
M(H2) = 2.0 g/mol
R=62.36367 L·mmHg·K⁻¹·mol⁻¹

D= PM/RT = (967mmHg*2.0 g/mol) / (62.36367 L·mmHg·K⁻¹·mol⁻¹*329K) =
 ≈ 0.0943 g/mol
D ≈ 0.0943 g/mol

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.