During a lab, we take the initial volume of water in a graduated cylinder to be 23.4 ml. After adding a screw to the water, it then raises to 27.6 ml. If the mass of the screw was found to be 7.1 grams- what would the density of the screw to be in g/ml? A) 3.89
B) 29.8
C) 3.40
D) 1.7

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

you need to have a picture of the atom that way we can answer it

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest