Answer:
Percent Yield Fe = 82.5%
Explanation:
The actual yield is the value produced after an experiment is conducted. The theoretical yield is the value calculated using the balanced chemical equation and atomic/molar masses.
To find the percent yield of iron (Fe), you need to (1) convert grams Al to moles Al (via atomic mass), then (2) convert moles Al to moles Fe (via mole-to-mole ratio from equation coefficients), then (3) convert moles Fe to grams Fe (via atomic mass), and then (4) calculate the percent yield. It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the sig figs of the given values.
Atomic Mass (Mg): 24.305 g/mol
Atomic Mass (Fe): 55.845 g/mol
3 Mg + 2 FeCl₃ -----> 2 Fe + 3 MgCl₂
20.5 g Mg 1 mole 2 moles Fe 55.845 g
----------------- x ----------------- x ---------------------- x ----------------- =
24.305 g 3 moles Mg 1 mole
= 31.4 g Fe
Actual Yield
Percent Yield = ---------------------------------- x 100%
Theoretical Yield
25.9 g Fe
Percent Yield = -------------------- x 100%
31.4 g Fe
Percent Yield = 82.5%
The system will adjust to this increase in the heat by promoting the dissolution reaction to absorb some of the heat energy
Answer:
Explanation: English please
Answer:
Explanation:
Here, we want to get the number of Joules needed to be added
Mathematically, this is the amount of heat needed which could be calculated by:
where:
m is the mass of the iron which is 1000 g
c is the specific heat capacity which is 0.449
delta T is the temperature change which is the difference between final and initial temperature (250-25 = 225 degrees celsius)
Substituting the values, we have it that:
The answer is: C. 3 : 2.
Balanced chemical reaction: 3H₂ + N₂ → 2NH₃.
From chemical reaction: n(H₂) : n(NH₃) = 3 : 2.
Coefficients with the lowest ratio indicate the relative amounts of substances in a reaction.
Coefficient in fron of hydrogen is 3 and coefficient in fron ammonia is 2.
Coefficients are important to prove the law of conservation of mass.
