Answer:
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Answer:
Electricity is made at a generating station by huge generators. The current is sent through transformers to increase the voltage to push the power long distances. The electrical charge goes through high-voltage transmission lines that stretch across the country.
Answer:
0.53
Explanation:
<em>A solution is made by mixing 42 g of chloroform (CHCl₃) and 31 g of heptane (C₇H₁₆). Calculate the mole fraction of chloroform in this solution. Be sure your answer has the correct number of significant digits.</em>
Step 1: Calculate the number of moles of chloroform
The molar mass of CHCl₃ is 119.38 g/mol.
42 g × 1 mol/119.38 g = 0.35 mol
Step 2: Calculate the number of moles of heptane
The molar mass of C₇H₁₆ is 100.20 g/mol.
31 g × 1 mol/100.20 g = 0.31 mol
Step 3: Calculate the total number of moles
We will use the following expression.
n = nCHCl₃ + nC₇H₁₆ = 0.35 mol + 0.31 mol = 0.66 mol
Step 4: Calculate the mole fraction of chloroform
We will use the following expression.
χ(CHCl₃) = nCHCl₃ / n
χ(CHCl₃) = 0.35 mol / 0.66 mol = 0.53
Isotopes are when an element has an extra or a lost electron. Elements work to have a full valence shell (having 8 electrons) Noble gases have full valence shells. Elements in group 1 tend to lose an electron to get this. Elements in group 17 tend to gain an electron to get 8.