Molar Mass of K2SO4
K= 39*2= 78 amu
S= 32*1 = 32 amu
O=16*4 = 64 amu
--------------------------
Molar Mass of K2SO4 = 78 + 32 + 64 = 174 g/mol
Data:
W (Molality) = ?
m1 (mass of the solute) = 12.50 g
m2 (mass of the solvent) = 100.00 g<span> (solution) - 12.50 g (solute) = 87.50 g (Solvent)</span>
MM (molar mass) = 174 g/mol
Formula:
Solving:
Answer:
c.
d.
Explanation:
An heterogeneous equilibrium is defined as a system whose reactants, products, or both are in more than one phase.
Also, you must know in an equilibrium constant you don't take solids or pure liquids. Thus:
a.
The reaction must be: NH₃(aq) + H₂O(l) ⇆ NH₄⁺(aq) + OH⁻(aq) <em>All reactants are in the same phase.</em>
b.
The reaction must be: HC₂H₃O₂(aq) ⇄ H⁺(aq) + C₂H₃O₂⁻(aq) <em>All reactants are in the same phase.</em>
c.
The reaction must be: 2NH₃(aq) + AgCl(s) ⇄ Ag(NH₃)₂⁺(aq) + Cl⁻(aq)
<em>Reactants aren´t in the same phase. Heterogeneous equilibrium</em>
d.
The reaction must be: BaF₂(s) ⇆ Ba²⁺(aq) + 2F⁻(aq)
<em>Reactants aren´t in the same phase. Heterogeneous equilibrium</em>
I hope it helps!
The troposphere protect the molecules because there are higher layers on top. This makes life possible on Earth.
B. The element nitrogen is made up only of nitrogen atoms.
Explanation:
Dalton stipulated , in his theory, that all the atoms of pure elements were identical. However different elements had different kinds of atoms that differ in their size and mass. The other stipulations of Dalton's theory were that atoms are the smallest unit of mass and were indivisible – this was later rebutted by advanced atomic theories .
Another major contribution by Dalton's theory is that chemical reactions involved the rearrangement of atoms observing the law of conservation of mass,