객관식
A solution has a concentration of 0.025 M HCl. How many moles of H+ are present per liter in this solution? (Use the decimal form of your answer.)
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles of CO_2 are present in a 220.-gram sample of CO_2, given that the gram-formula mass of CO_2 is 44 g/mol?
A
44 moles
B
220 moles
C
0.20 moles
D
5.0 moles
검증된 단계별 안내1
Identify the given information: the mass of the CO_2 sample is 220 grams, and the gram-formula mass (molar mass) of CO_2 is 44 g/mol.
Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{220}{44}\).
Perform the division to find the number of moles of CO_2 in the sample.
Interpret the result as the amount of substance in moles present in the 220-gram CO_2 sample.
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