Oxygen is supplied to a medical facility from ten $1\mathrm{.}600ft3$ compressed oxygen tanks. Initially, these tanks are at $1500$ psia and $80F.$ The oxygen is removed from these tanks

slowly enough that the temperature in the tanks remain at $80F.$ After two weeks, the pressure in the tanks is $300$ psia. Determine the mass of oxygen used and the total heat

transfer to the tanks. The gas constant of oxygen is $=0\mathrm{.}219Bt\frac{u}{l}bm*R$ and $c_v=0\mathrm{.}157Bt\frac{u}{l}bm*R.$

The mass of oxygen used is $106\mathrm{.}041kg.$

The total heat transfer is $3550\mathrm{.}254W.$

The mass of oxygen used is $106\mathrm{.}041lbm.$

The total heat transfer is $3550\mathrm{.}254$ Btu.

The mass of oxygen used is $10\mathrm{.}041lbm.$

The total heat transfer is $355\mathrm{.}254$Btu.

The mass of oxygen used is $135\mathrm{.}041lbm.$

The total heat transfer is $3980\mathrm{.}254$ Btu.