a) Carbon and oxygen are chemically bonded in carbon dioxide.
The elements lose their individual identities in CO₂, and they always combine o the proportion C:O = 1:2.
You cannot separate the elements from each other by physical means.
Molar mass MgCO3 => 84.31 g/mol
1 mole MgCO3 ----------- 84.31 g
1.5 moles MgCO3-------- ??
1.5 x 84.31 / 1 => 126.465 g
C. because i take college classes and I've did this before
Given: 2.00 m h2so4 / L
0.250 moles
Solve
To get the volume we need to divide 0.250 moles from 2.00 moles / L
Volume = (0.250 moles)
-----------------------
(2.00 moles/L)
= 0.125 L x 100
= 125 ml
So the answer is 125 milliliters of 2.00 m h2so4 are necessary to provide 0.250 mole of it.
Chemical should be the answer hope I helped