Which statement best compares frogs and toads with salamanders?
frogs and toads lose their tails as they develop into adults, but salamanders keep their tails.
salamanders have lungs from the time they hatch, but frogs and toads have gills when they first hatch.
frog and toad eggs are covered in a soft, jellylike substance, but salamander eggs are covered in a hard shell.
salamander offspring are born with long legs that eventually shorten, but frogs and toads are born without legs.

Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails

Explanation:

The salamanders, frogs, and toads are part of the amphibian family. They all live in both water and land. The water is still crucial for their live, despite them being relatively well developed for terrestrial live, with the biggest importance being that their offspring needs it in order to develop. The salamander offspring has only front limbs and tail, thus it can not live on land until it is fully developed, while the frog and toad offspring doesn't have any limbs at the start, only tail, thus not being able to even come out of the water. As they mature, the salamander offspring develops hind limbs as well, while retaining the tail. The frog and toad offspring develops front and back limbs, but its loses its tail.

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

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