3.
What mass of sucrose (density = 1.58 g/cm) is needed to have a volume of
15.2 cm

Density=1.58 g/cm

Volume=15.2 cm

Density=mass/volume

Then,

Mass = density×volume

Mass=1.58×15.2

Mass=24.016g

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answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.