The concentration of sodium ion is 1.194 M
<u><em>calculation</em></u>
Step 1: write the equation for dissociation of Na₃P
Na₃P → 3 Na⁺(aq) + P⁻ (aq)
Step 2: find the moles of Na₃p
MOLES = molarity x volume in liters
= 4.57 L x 0.398 M = 1.819 moles
Step 3: use the mole ratio to calculate the moles of Na⁺
Na₃P: Na⁺ is 1:3 therefore the moles of Na⁺ = 3 x 1.819 = 5.457 moles
Step 4 : find the concentration (molarity) of Na⁺
molarity = moles /volume in liters
=5.457 moles / 4.57 = 1.194 M
Manganese is an element.
Manganese is the 25th element on the periodic table. As it is an element, it means it cannot be separated or broken down into anything simpler, even by chemical methods such a electrolysis.
In additional, compound is where 2 or more elements are chemically bonded together, which usually involves heat, while mixture is where 2 or more elements or Compounds mixed together in any proportions.
Answer:
(a) 4 %; (b) 5 %
Explanation:
We need a Cu-Ag phase diagram to answer these questions (see diagram). Yours may differ slightly from the one I used.
(a) Cu in Ag
The horizontal red line at 700 °C cuts the right-hand solvus at about 4 % Ag-96 % Cu.
At this point, copper is in equilibrium with the eutectic.
At 700 °C, the maximum solubility of Cu is about 4 % by mass.
(b) Ag in Cu
The horizontal red line at 700 °C cuts the left-hand solvus at about 5 % Cu-95 % Ag.
At this point, silver is in equilibrium with the eutectic.
At 700 °C, the maximum solubility of Ag is about 5 % by mass.
A.
25km x 10^3m/1km x 1cm/10^-2m
cancel out km and m left with cm
