Concentration is found by dividing the mass of solute by the volume of the solution. C = 4.2g/0.25 L. C= 16.8 g/L
This magmatic rock consists of volcanic glass (SiO₂,MgO,Fe₃O₄). It is the homogeneous volcanic glass with small water content. Therefore obsidian is very brilliant. In the ancient time made mirrors of it.
4.0 g water. Water is the limiting reactant. Therefore there will be excess oxygen.
It’s not C.The answer is B.Because as you know,Ionic bonding is the electrostatic forces of attraction between the positive and negative ions.It is a transfer of electrons between the metals(positively charged ions) and non-metals (negatively charged ions)
—->As for this case,iron is a metal and oxygen is a non-metal based on the periodic table.Hence the answer is B.
