A student noticed that the magnesium ribbon appeared to be oxidized-the metal surface was black and dull rather than silver and shiny. What effect would this error have on the measured volume of hydrogen gas? Would the calculated molar volume of hydrogen be too high or too low as a result of this error? Explain.

if the number of moles increase the volume will also increase. If a lower volume was recorded alower calculated molar mass would be observed because, there would be less of a volume overyour number of moles because the number of moles of Hydrogen gas is found theoretically withhow much Mg was used.8. A student noticed that the magnesium ribbon appeared to be oxidized—the metal surface wasblack and dull rather than silver and shiny. What effect would this error have on the measuredvolume of hydrogen gas? Would the calculated molar volume of hydrogen be too high or toolow as a result of this error? Explain.If the Mg ribbon was oxidized, the volume of Hydrogen gas recorded would be less thanthe idealized result because less Mg would react to make Hydrogen gas. This would result in themolar volume decreasing because there would be less volume per mole hydrogen. The decreasedmolar volume would contribute to a larger density because the mass would be divided by asmaller volume.ConclusionThe purpose of this lab was to determine the molar volume of H2(g)at STP. We were ableto carry out this task by reacting a known amount of Mg with HCl in a eudiometer tube filledwith water so that volume of the gas created would be measurable. The main purpose of the lab

Explanation:

because if you increase the number then you get this

asking the goog might u get an answer

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !