Volume of snow block
$V = \frac{1}{2} [ \, \frac{4}{3}\pi (8^3 – 6^3) \, ]$
$V = 619.94 \, \text{ ft}^3$
Weight of the igloo
$W = \gamma V = 40(619.94)$
$W = 24~797.64 \, \text{ lb}$ answer
Volume of air inside the igloo
$V_{air} = \frac{1}{2} [ \, \frac{4}{3}\pi (6^3) \, ]$
$V_{air} = 144\pi \, \text{ ft}^3$
Amount of carbon dioxide in the air
$V = 0.0004(144\pi) = 0.0576\pi$
$V = 0.181 \, \text{ ft}^3$ answer