Answer:
Salicylic Acid is the limiting reagent
Theoretical yield Aspirin: 1.62 g
Percent yield: 76 %
Explanation:
The balanced chemical reaction is
C4H6O3+C7H6O3 ⇒ C9H8O4+C2H4O2
Therefore is a 1:1 reaction. This information along the molecular weights of C4H6O3 (MW: 102.9 g/mol), C7H6O3 (MW: 138.1 g/mol) and C9H8O4 (MW: 180.2 g/mol) is sufficient to answer the question once we have converted the mass to mol for the reactants.
mass C2H4O2 = d x v = 2.90 mL x 1.08 g/mL = 3.13 g
# mol C2H4O2 = 3.13 g/102.9 g/mol = 0.030
# mol C7H6O3 = 1.28 g/138.1 g/mol = 0.009
Therefore C7H6O3 is the limiting reagent since it reacts 1: 1 with C2H4O2
Calculation of theoretical yield:
0.009 mol C7H6O3 x 1 mol C9H8O4 / 1mol C7H6O3 = 0.009 mol C9H8O4
Now we convert mol of aspirin :
0.009 mol C9H8O4 x 180.2 g/mol = 1.62 g ( 100 % yield)
Percent yield:
1.23 g collected/ 1.62 g x 100 = 76 %
Answer:
FeCl₃ + <u>3</u>NaOH → Fe(OH)₃ + <u>3</u>NaCl
Explanation:
You are given a skeleton equation, or unbalanced equation.
FeCl₃ + NaOH → Fe(OH)₃ + NaCl
<u>Count the number of atoms on each side</u>. If there is 1 atom, the subscript is not written. If the subscript to the right of a bracket, it belongs to each element in the bracket.
Reactants → Products
Fe 1 Fe 1
Cl 3 Cl 1 Not balanced
Na 1 Na 1
O 1 O 3 Not balanced
H 1 H 3 Not balanced
<u>The number of each element must be the same in the reactants and products.</u> We can see that Cl (chlorine), O (oxygen) and H (hydrogen) have different numbers.
<u>Write in coefficients in front of formulas</u> (separated by + sign). Coefficients multiply each subscript (or "1" if not written) in the formula. <u>Recount the atoms until you have equal reactant and product atom numbers.</u>
I see that I need more chlorine in my products. Multiply the formula that has "Cl" by 3.
FeCl₃ + NaOH → Fe(OH)₃ + 3NaCl
Reactants → Products
Fe 1 Fe 1
Cl 3 Cl 3 Cl is balanced now.
Na 1 Na 3 Not balanced
O 1 O 3 Not balanced
H 1 H 3 Not balanced
Fix the "Na" now. Multiply the formula with "Na" on the left by 3.
FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl
Reactants → Products
Fe 1 Fe 1
Cl 3 Cl 3
Na 3 Na 3
O 3 O 3
H 3 H 3
Each side has the same number of each element. Therefore, this is balanced now.
Balanced formula:
FeCl₃ + <u>3</u>NaOH → Fe(OH)₃ + <u>3</u>NaCl
A. is the answer
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I know all it's names,but i cann't say the value of yone in english.if u learn it to me i will help u.
Explanation:
oxygen and are negatively charged anions because the oxygen atoms attract electrons. Ammonium is one of the few positively charged polyatomic ions or cations and doesn't contain oxygen.
