Q$\mathrm{.}4.$ Suppose a fusion reactor ran on $"$D$-$D$"$ reactions, in equal amounts.

Estimate how much natural water, for fuel, would be needed per hour to run a $1150-$MW

reactor, assuming $33\%$ efficiency.

${?}_1^{2}H+{?}_1^{2}H{?}_1^{3}H+{?}_1^{1}H$

${?}_1^{2}H+{?}_1^{2}H{?}_2^{3}He+n$

$D$ is present in hydrogen, as in water, with an abundance of only $0\mathrm{.}0156\%.$