Answer:
The answer to your question is the letter B) 1.53 M
Explanation:
Data
Molarity = ?
volume = 225 ml
mass of KNO₃ = 34.8 g
molar mass = 101.1 g/mol
Process
1.- Convert the ml to liters
1000 ml ------------------ 1 l
225 ml ------------------- x
x = (225 x 1) / 1000
x = 0.225 l
2.- Convert the mass of KNO₃ to moles
101.1 g ---------------------- 1 mol
34.8 g --------------------- x
x = (34.8 x 1) / 101.1
x = 0.344 moles
3.- Calculate the Molarity
Molarity = moles/volume
-Substitution
Molarity = 0.344/ 0.225
-Result
Molarity = 1.53 M
The total pressure in the container is <u>2.02</u> atm.
<em>Step</em> 1. Calculate the<em> total number of moles.
</em>
Moles of He = 1.00 g He × (1.00 mol He/4.003 g He) = 0.2498 mol He
Moles of F₂ = 14.0 g F₂ × (1 mol F₂/38.00 g F₂) = 0.3684 mol F₂
Moles of Ar = 19.00 g Ar × (1 mol Ar/39.95 g Ar) = 0.4756 mol Ar
<em>Total moles</em> = (0.2498 + 0.3684 + 0.4756) mol = <em>1.094 mol
</em>
<em>Step </em>2. Calculate the <em>total pressure</em>.
Use the <em>Ideal Gas Law</em>: <em>pV = nRT
</em>
We can solve the equation to get the pressure:
<em>p</em> = (<em>nRT</em>)/<em>V</em>
<em>n</em> = 1.094 mol
<em>R</em> = 0.082 06 L·atm·K⁻¹mol⁻¹
<em>T</em> = (20.0 + 273.15) K = 293.15 K
<em>V</em> = 13.0 L
∴ <em>p</em> = (1.094 mol × 0.082 06 L·atm·K⁻¹mol⁻¹ × 293.15 K)/13.0 L = 2.02 atm
concentration of the contact solution = 3 %
Explanation:
We have the following data:
10.7 g of hydrogen peroxide H₂O₂
355 g of solution
To calculate the concentration of the contact solution we use the following formula:
concentration = (mass of solute / mass of solution) × 100
concentration of the contact solution = (10.7 / 355) × 100
concentration of the contact solution = 3 %
Learn more about:
concentration of solutions
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D I believe sorry if wrong
Since the colors moved faster in the hit water, it means that the water molecules in the hot water move faster than the molecules in the cold water.