객관식
How does the polarity of water contribute to its ability to dissolve so many substances?
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3. Water
Properties of Water- The Universal Solvent
객관식
A mole of ethyl alcohol weighs 46 g. How many grams of ethyl alcohol are needed to produce 1 L of a 2-millimolar (2 mM) solution?
A
92 g
B
9.2 g
C
0.92 g
D
0.092 g
검증된 단계별 안내1
Understand that a 2-millimolar (2 mM) solution means there are 2 millimoles of solute per liter of solution.
Convert millimoles to moles: 2 millimoles is equal to 0.002 moles (since 1 millimole = 0.001 moles).
Use the molar mass of ethyl alcohol to find the mass in grams. The molar mass of ethyl alcohol is 46 g/mol.
Calculate the mass of ethyl alcohol needed using the formula: mass (g) = moles × molar mass. Substitute the values: mass = 0.002 moles × 46 g/mol.
Perform the multiplication to find the mass in grams, which will give you the amount of ethyl alcohol needed for the solution.
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