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velikii [3]
4 years ago
9

PLEASE NEED HELP!!!!!

Chemistry
1 answer:
Andre45 [30]4 years ago
4 0

Either reject or validate your hypothesis.

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How many grams of sodium chloride are present in a 0.75 M solution with a volume of 500.0 mililiters
Ilya [14]
<em>C = 0,75 mol/dm³</em>
<em>V = 500mL = 500cm³ = 0,5dm³</em>

C = n/V
n = 0,75×0,5dm³
<u>n = 0,375 moles</u>

<em>M NaCl:  23+35,5 = 58,5g</em>


1 mole ---------- 58,5g
0,375 ----------- X
X = 0,375×58,5
<u>X = 21,9375g NaCl</u>

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4 years ago
A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity of 5.65 kJ/°C. Using the information be
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To answer the question above, we need to c<span>onvert 12.8 g to moles by dividing by 46.07 first.</span>

<span>For every mole you burn, you get 1235 kJ of heat. So multiply your number of moles by 1235. It'll be something in the neighborhood of 500. </span>

<span>Take your kJ that you calculated and divide by 5.65 to get the number of degrees that your calorimeter goes up. Add that to 25.

I hope my answer helped you</span>
8 0
4 years ago
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Which terms are used to identify pure substances?an element and a mixturean element and a compounda solution and a mixturea solu
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<span>Answer: an element and a compound.
An element is a pure substance formed by one kind of atoms (element).
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7 0
3 years ago
Which elements make up 95 percent (by weight) of the human body?
Alex17521 [72]
Oxygen,carbon,hydrogen,and nitrogen- together make up 95 percent of the mass of the human body.
Hope this helps.
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3 years ago
all matter has both physical and chemical properties. a physical property can be observed without changing the identity of the s
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The Correct answer is A.
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