Protons and neutrons exist within the neucleus, while electrons do not.
A circuit with many paths for the current to travel through and not simply one is classified as a parallel circuit. Here the circuit can have many loops of resistors or light bulbs that can be attached.
Answer:
The answer to your question is 0.6 M
Explanation:
Data
Volume of HBr = 50 ml
Volume of NaOH = 20 ml
[NaOH] = 1.5 M
[HBr] = ?
Process
1.- Calculate the moles of NaOH
Molarity = moles/volume
-Solve for moles
moles = Molarity x volume
-Substitution
moles = 1.5 x 0.02
-Result
moles = 0.03
2.- Write the balanced reaction
HBr + NaOH ⇒ NaBr + H₂O
3.- Calculate the moles of HBr
1 moles HBr ------------------ 1 moles NaOH
x moles HBr --------------- 0.03 moles of NaOH
x = (0.03 x 1) / 1
x = 0.03 moles of HBr
4.- Calculate the concentration of HBr.
Molarity = 0.03 / 0.05
Molarity = 0.6 M
Answer:
1. Percentage by weight = 0.5023 = 50.23 %
2. molar fraction =0.153
Explanation:
We know that
Molar mass of HClO4 = 100.46 g/mol
So the mass of 5 Moles= 5 x 100.46
Mass (m)= 5 x 100.46 = 502.3 g
Lets assume that aqueous solution of HClO4 and the density of solution is equal to density of water.
Given that concentration HClO4 is 5 M it means that it have 5 moles of HClO4 in 1000 ml.
We know that
Mass = density x volume
Mass of 1000 ml solution = 1 x 1000 =1000 ( density = 1 gm/ml)
m'=1000 g
1.
Percentage by weight = 502.3 /1000
Percentage by weight = 0.5023 = 50.23 %
2.
We know that
molar mass of water = 18 g/mol
mass of water in 1000 ml = 1000 - 502.3 g=497.9 g
So moles of water = 497.7 /18 mole
moles of water = 27.65 moles
So molar fraction = 5/(5+27.65)
molar fraction =0.153
Answer:
barium?
Explanation:
I don't know, I'm guessing