Which statement(s) below describe(s) the best relationship between the independent and dependent variable of an experiment? Please check all that apply in an experiment you manipulate the dependent variable which creates the independent variable.

In an experiment the dependent variable is the cause while the independent variable is the effect.

In an experiment you manipulate the independent variable and measure the outcome of the dependent variable.

In an experiment the independent variable is the cause while the dependent variable is the effect.

The dependent variable is what the scientist changes, while the independent variable is what is being studied/measured.

The independent variable is what the scientist changes, while the dependent variable is what is being studied/measured.

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

2b2t

explanation:

2b2t

the answer is 0.8m.

by: nicholas

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