700,000 in scientific notation is 7 x 10^5
Universe grows and cools until 100 seconds after the Big Bang. The temperature is 1 billion degrees, 109 K. Electrons and positrons annihilate to make more photons, while protons and neutrons combine to make deuterons. Almost all of the deuterons combine to make helium.
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Answer:
No. of molecules= mass/molar mass ×avogadro no.
= 13.2/50×6.02×10°23
No. of molecules =1.59×10°23
Explanation:
Answer : The equilibrium concentration of is, 1.0 M
Explanation : Given,
Equilibrium concentration of = 0.26 M
Volume of solution = 1.00 L
Equilibrium constant = 4.0
The balanced equilibrium reaction will be,
The expression of equilibrium constant for the reaction will be:
From the reaction we conclude that the concentration of and are equal.
Let the concentration of be 'X'.
So, concentration of = X
Now put all the values in this expression, we get :
Thus,
The concentration of at equilibrium = X = 1.0 M
The concentration of at equilibrium = X = 1.0 M
Answer:
a) 38.2 % mass
b) 61.8 g solute/100 g solvent
c) 1.65 g/mL
Explanation:
Given the data:
mass of solute = 17.5 g
mass of solvent= 28.3 g
total solution volume= 27.8 mL
a)- mass percent= mass of solute/mass of solution x 100
mass of solution = mass solute + mass solvent = 17.5 g + 28.3 g = 45.8 g
mass % = 17.5 g/45.8 g x 100 = 38.2 % mass
b)- solubility = grams of solute/ 100 g solvent
= 17.5 g x (100 g /28.3 g solvent) = 61.8 g solute/100 g solvent
c)- density = massof solution/total volumesolution = 45.8 g/27.8 mL = 1.65 g/mL