From counting the on Venus, scientists estimate that its surface is between 300 and million years old.?

volcanoes, 600

craters, 450

volcanoes, 200

craters, 600

From counting the craters on Venus, scientists estimate that its surface is between 300 and 600 million years old.

Explanation:

Venus is the second planet after sun and the second brightest object in the sky after the moon. It does not have moons and it is called earths sister because of  their similar size, mass, distance to the sun and composition. Because of the absence of lava flow on Venus, the planet has few craters thereby suggesting that the surface is relatively young and between 300 and 600 million years old.

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

c

explanation: