Final answer:
The density of carbon dioxide gas in this example, calculated using the formula D = m / V, is 0.0025 g/ml. This corresponds to answer choice d).
Step-by-step explanation:
The density (D) of any substance, including carbon dioxide gas, can be calculated using the formula D = m / V, where m = mass and V = volume. In this case, the mass (m) of the gas is 0.25 g and its volume (V) is 100 ml.
When you plug these values into the formula, you get D = 0.25 g / 100 ml = 0.0025 g/ml.
Therefore, the density of the carbon dioxide gas in this example is 0.0025 g/ml, which corresponds to answer choice d).
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