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
Answer:
C
Explanation:
All thing in option c is flammable
Density can be calculated using the following rule:
density = mass / volume
Therefore,
volume = mass / density
For diamond:
we have mass = 0.5 grams and density = 3.51 g / cm^3
Substituting in the rule, we can calculate the volume of diamond as follows:
volume = 0.5 / 3.51 = 0.14245 cm^3
For graphite:
we have mass = 0.5 grams and density = 2.25 g / cm^3
Substituting in the rule, we can calculate the volume of graphite as follows:
volume = 0.5 / 2.25 = 0.2223 cm^3
