The amount of heat, H, needed to boil off certain mass, m, of the substance is given by the equation,
H = mHv
where Hv is the heat of vaporization. Manipulating the equation, the mass is calculated by,
m = H/Hv
Substituting the known values,
m = 15000 J/(850 J/g) = 17.65 g
Thus, the mass of ethyl alcohol is approximately 17.65 g.
<span>A 22.4-L sample of which of the following substances, at STP, would contain 6.02 x 1023 representative particles should be nitrogen. The answer is C. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
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Correct answer: C) 3 eggs
The given recipe for preparing 100 brownies,
6 eggs + 5 cups flour + 2 sticks butter ----> 100 brownies
Assuming the number of each starting material/ product as the moles of each reactant/product. The mole ratios of the different reactants and product is:
;
;
We would need the mole ratio of eggs/brownies in order to find out the number of eggs required to prepare 50 brownies.
Always remember that pH + pOH = 14
Here, you have a pOH of 11.24, so you replace it in the equation, and u get:
pH + 11.24 = 14
Then, You move 11.24 to the other part. and moving from a part to another change the sign of the equation. And you get:
pH = 14 - 11.24 = 2.76
So, the pH of a solution that has a pOH of 11.24 is pH = 2.76
Hope this Helps :)
d, one atom of oxygen and two atoms of hydrogen
