Answer:
A. Theoretical yield = 3.51g
B. %yield = 75%
Explanation:
The balanced equation for the reaction is given below:
C2H4 + 3O2 —> 2CO2 + 2H2O
Molar Mass of O2 = 16 x 2 = 32g/mol
Mass of O2 from the balanced equation = 3 x 32 = 96
Molar Mass of H20 = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g
A. From the equation,
96g of O2 produced 36g of H2O
Therefore, 9.35g of O2 will produce = (9.35 x 36)/96 = 3.51g of H2O
Therefore,theoretical yield of water (H2O) = 3.51g
B. Theoretical yield = 3.51
Actual yield = 2.63g
%yield =?
%yield = Actual yield/Theoretical yield x 100
%yield = 2.63/3.51
%yield = 75%
Answer:
Specific heat of copper = 0.385 J/(gi°C)
Explanation:
Given:
Mass of copper (m) = 200 g =
Initial temperature (T1) = 20°C
Final temperature (T2) = 40°C
Heat needed (Q) = 1,540 J
Find:
Specific heat of copper = ?
Computation:
⇒ Change in temperature (ΔT) = T2 - T1
⇒ Change in temperature (ΔT) = 40°C - 20°C
⇒ Change in temperature (ΔT) = 20°C
⇒ Specific heat of copper = Q / [mΔT]
⇒ Specific heat of copper = 1,540 / [(200)(20)]
Specific heat of copper = 0.385 J/(gi°C)
Recrystallization is when new mineral grains form as a result of metarmorphic heat that are larger than the original mineral grains.
Recrystallization is a metamorphic process that occurs under situations of intense temperature and pressure where grains, atoms or molecules of a rock or mineral are packed closer together, creating a new crystal structure.
Answer: 12,6 gam
Explanation: Hãy thử xem bạn có đồng ý không, tôi đang bối rối
