As the result of experimental work, a student finds the density of a liquid to be .137 g/ml. the known density of the liquid is .1478 g/ml. find the student's experimental error (ee) and percentage error (pe).
Answers
the known density of the liquid is
the density of a liquid
Thus, experimental error of 0.0108 g /mL is present.
Thus, Percentage error of 7.31 % is present.
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a. 7.30 g
b. 93.3 g
c. 146 g
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e. 196 g
Answers
One mole of NaCl yields one mole of HCl, hence we'll make at most
That would be answer B (the difference probably comes from the molar mass of Cl that I chose, 35.5, whereas some prefer to take 35.4)
Final answer:
The question tackles stoichiometry, a Chemistry concept used to calculate reactant or product amount. Given 2 moles of H2SO4 and 2.56 moles of NaCl, the H2SO4 is limited, resulting in 4 moles of HCl. The weight of 4 moles of HCl is 146 g, thus, the answer is c. 146 g.
Explanation:
The subject of this question is stoichiometry, a method used in Chemistry to calculate the amount of reactants or products in a particular chemical reaction. According to the balanced equation, 2 moles of NaCl react with 1 mole H2SO4 to yield 2 moles of HCl. Meaning, 1 mole of H2SO4 can only react effectively with 2 moles NaCl. However, we have 2.56 mol of NaCl. This means that the H2SO4 is the limiting reagent. Thus, 2 mol H2SO4 will yield 4 mol of HCl (since it's 2:2 ratio).
The molecular weight of HCl is 36.5 g/mol. Therefore, the weight of 4 moles of HCl is 4 mol * 36.5 g/mol = 146 g. Thus, the correct answer is c. 146 g.
Learn more about Stoichiometry here:
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Answer:
I got you..you need help but with which question?
Explanation:
Have a great day!
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Answers
Answer:
The answer is c. 173 g
Explanation:
You know the reaction :
KClO3 ⇒ 2 KCl + 3 O2
By stoichiometry, that is, the amount of reagents and products in a chemical reaction when it is balanced (as in this case), it is known that for 2 moles of O2, 1 mole of KCLO3 is needed. So you can do the following rule of three to know the number of moles to produce 4.26 moles of 02:
If 1 mole of KClO3 is necessary to produce 3 moles of O2, how many moles are needed to produce 4.26 moles of 02?
So you need 1.42 moles of KClO3
Now it is necessary to know the molar mass of KClO3, which is the mass that contains 1 mole of the substance. For that you need to know the mass of K, Cl and O:
- K: 39 g/mol
- Cl: 35.45 g/mol
- O: 16 g/mol
So, the molar mass of KClO3 is:
39 g/mol + 35.45 g/mol + 3*16 g/mol=122.45 g/mol
because it contains 1 atom of K, 1 atom of Cl and 3 atoms of O.
Now, to calculate the mass representing 1.42 moles of KClO3 (needed to produce 4.26 moles of O2) you simply multiply that amount of moles by the molar mass:
This means that approximately 174 g of KClO3 are necessary to produce 4.26 moles of O2.
2KClO3 -> 2KCl + 3O2 (Always check if equation is balanced - in this case it is)
4.26moles
So we know that we have 4.26 moles of oxygen (O2). Now lets look at the ratio between KClO3 and O2.
We see that the ratio is 2:3 meaning that we need 2KClO3 in order to produce 3O2.
Therefore divide 4.26 by 3 and then multiply by 2.
4.26/3 = 1.42
1.42 * 2 = 2.84
Now we know that the molarity of KClO3 is 2.84 moles.
Multiply by R.M.M to find how many grams of KClO3 we have.
R.M.M of KClO3
K- 39
Cl- 35.5
3O- 3 * 16 -> 48
---------------------------
122.5
2.84 * 122.5 = 347.9 grams therefore the answer is (a)
348 grams needed of KClO3 to produce 4.26 moles of O2.
Hope this helps :).
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Answer:
To answer, all living organisms contain carbon-based compounds, which classifies them organic.
Simply, carbon dioxide, is an example of an inorganic compound since it does not contain both carbon and hydrogen. Alternatively, one molecule of carbon dioxide contains one atom of carbon and two atoms of oxygen.
Answers
The answer is electrolyte.
That is electrolyte is the type of minerals that is associated with maintaining water balance, osmotic equilibrium, acid-base balance and intracellular/extracellular differential.
Sodium, potassium and chlorides are the macrominerals that are known as the electrolytes, that are very important for the function says maintaining water balance, osmotic equilibrium, acid-base balance and intracellular/extracellular differential .