I would typically assume it is error in the state (s, l, g, aq) but depending on what reaction i couldn't say for sure
Predators feed on other animals and keep the ecosystem in balance
gold density = 19.3 g/cm³
mass = 16.5 kg = 16.5 x 10³ g
volume = 954 ml
gold density based on the experiments:
ρ = 16.5 x 10³ g / 954 ml(cm³) = 17.296 g/cm³ ( not of pure gold)
If your hypothesis is correct then you can go further with the experiment but,if the experiment is incorrect then you'll have to make another hypothesis. :)
The second one, b synthesis reaction