Answer:
0.400 mL
Explanation:
Hello, the dilution factor (in folds) is given by:
Thus, the sample volume with three significant figures is given by:
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Venus & Mars are the 2 planetss
Answer:
72.4%
Explanation:
Step 1: Write the balanced equation
2 Cu + S ⇒ Cu₂S
Step 2: Calculate the theoretical yield, in moles, from 0.0970 moles of Cu
The molar ratio of Cu to Cu₂S is 2:1.
0.0970 mol Cu × 1 mol Cu₂S/2 mol Cu = 0.0485 mol Cu₂S
Step 3, Convert the theoretical yield to mass
The molar mass of Cu₂S is 159.16 g/mol.
0.0485 mol × 159.16 g/mol = 7.72 g
Step 4: Calculate the percent yield
We will use the following expression.
%yield = experimental yield/theoretical yield × 100%
%yield = 5.59 g/7.72 g × 100% = 72.4%
Answer:
B
Explanation:
Generally, when you dilute something, your goal is to thin your concentration. Even if you added a solute, if your goal is dilution, it will make the concentration decrease.
Answer: 0.0195g of CO2 is produced
Explanation:
CH4 + 2O2 —> CO2 + 2H2O
Molar Mass of CO2 = 12 + (16x2) = 12 + 32 = 44g/mol
Molar Mass of CH4 = 12 + (4x1) = 12 + 4 = 16g/mol
From the equation,
16g of CH4 produce 44g of CO2.
Therefore 7.10×10^−3 of CH4 will produce Xg of CO2 i.e
Xg of CO2 = (7.10×10^−3x44) /16 = 0.0195g