Answer
$$1.58 \space kg$$
Work Step by Step
$$V = \pi r^2 h = \pi \times (1.88 \space cm)^2 \times (18.35 \space cm) = 204 \space cm^3$$ $$d = \frac{m}{V} \longrightarrow m = V \times d$$ $$m = (204 \space cm^3) \times (7.75 \space g/cm^3) = 1580 \space g$$ $$m = 1580 \space g \times \frac{1 \space kg}{1000 \space g} = 1.58 \space kg$$
