Answer
See answer below.
Work Step by Step
a) From a linear regression:
Intercept: 0.0240
Slope: $0.2056\times10^6$
b) From the curve:
$0.518=0.0240+0.2056\times10^6\times x$
$x=2.40\times10^{-6}\ g/L$
c) $2.40\times10^{-6}\ g/L\times 1.122\ L=2.70\times10^{-6}\ g$
