A solvent (from the Latin solvō, "I loosen, untie, I solve") is a substance that dissolves a solute (a chemically distinct liquid, solid or gas), resulting in a solution. A solvent is usually a liquid but can also be a solid or a gas. The quantity of solute that can dissolve in a specific volume of solvent varies with temperature. Common uses for organic solvents are in dry cleaning (e.g., tetrachloroethylene), as paint thinners (e.g., toluene, turpentine), as nail polish removers and glue solvents (acetone, methyl acetate, ethyl acetate), in spot removers (e.g., hexane, petrol ether), in detergents (citrus terpenes) and in perfumes (ethanol). Water is a solvent for polar molecules and the most common solvent used by living things; all the ions and proteins in a cell are dissolved in water within a cell. Solvents find various applications in chemical, pharmaceutical, oil, and gas industries, including in chemical syntheses and purification processes.
source: wikapedia
A.has mass and takes up space
1. Chemical eqn:
Hg(ClO4)2 + Na2S -> HgS + 2NaClO4
mercury perchlorate has a molar mass of 399.5g/mol (1d.p) and for Na2S it is 78.0g/mol (1d.p.)
no. of moles of mercury perchlorate= 48.99÷399.5= 0.12263mol(5s.f.)
no. of moles of Na2S= 8.564÷78.0= 0.10979mol ( 5s.f.)
so no. of moles of Hg(ClO4)2/ no. of moles of Na2S= 1/1 according to the eqn
so no. of moles of Hg(ClO4)2 needed if all Na2S is used up is 1/1×0.10979= 0.10979 mols
since no. of moles of mercury perchlorate needed < no. of moles of it provided, it is in excess and Na2S is the limiting factor.
since HgS is a solid and NaClO4 is aqueous, solid ppt formed will only be HgS.
no. of moles of HgS/ no. of moles of NaClO4= 1/1
no. of moles of HgS produced= 0.10979mols
molar mass of HgS= 232.7g/mol 1d.p.
grams of solid produced= 232.7×0.10979= 25.5g (3s.f.)
2. reactant in excess is Hg(ClO4)2,
no. of excess moles= 0.12263-0.10979= 0.01284mols
grams of excess reactant= 0.01284×399.5= 5.13g (3s.f.)
It looks like part of the Periodic Table. Do you have to write down the most common Periodic Table elements? If so, then that's probably what you should do.
Answer:
A perfect mold of a dinosaur bone
