Hello there!
Your answer is: <span>A) Sarah walks quickly across the carpet in socks and feels a small shock on her foot.
This is because this could happen with out man-made electrical appliances. Light bulbs, wall sockets, and curling irons are all man-made, therefor not naturally-occurring. </span>
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~ Zoe
Molar mass NaOH =23+16+1=40 g/mol
<span> 0.100 M= 0.100 mol/L
</span>500 ml=0.500 L
0.500L*0.100 mol/L=0.0500 mol NaOH we need to prepare 500 ml solution
0.0500 mol NaOH*40g/1mol=2 g NaOH we need to prepare 500 ml solution
we need 2 g NaOH, dissolve it in small amount of water, and dilute it with water up to 500 mL
Answer:
0.0400 g for the example given below.
Explanation:
pH value is not provided, so we'll solve this problem in a general case and then we will use an example to justify it.
- By definition, .
- NaOH is a strong base, as it's a hydroxide formed with a group 1A metal, so it dissociates fully in water by the equation: .
- From the equation above, using stoichiometry we can tell that the molarity of hydroxide is equal to the molarity of NaOH: .
- Concentration of hydroxide is then equal to the ratio of moles of NaOH and the volume of the given solution. Moles themselves are equal to mass over molar mass, so we obtain: .
- We also know that . Take the antilog of both sides: .
- Solve for the mass of NaOH: .
Now, let's say that pH is given as 12.00 and we use a 100-ml volumetric flask. Then we would obtain:
Answer:
120 liters
Explanation:
From the question,
Applying boyles law
PV = P'V'................ Equation 1
Where P = initial pressure, V = Initial Volume, P' = Final pressure, V' = Final Volume.
make V' The subject of the equation
V' = PV/P'............. Equation 2
Given: P = 2 kpa, V = 60 liters, P' = 1 kpa
Substitute these values into equation 2
V' = (2×60)/1
V' = 120 liters
Hence the right option is A. 120 liters