Final answer:
The mass of 0.0260 milliliters of helium in grams, assuming the density is 0.1785 g/L, is approximately 0.00464 grams. None of the answer options provided match this calculated value, suggesting a discrepancy within the question or answer choices.
Step-by-step explanation:
To convert mil of helium to grams, we need to clarify what a mil is. Assuming 'mil' is a typographical error and the student meant to ask about converting milliliters (mL) of helium to grams, we can use the density of helium to perform the conversion. We know helium has a density of approximately 0.1785 grams per liter (g/L) at standard temperature and pressure. Since density is mass divided by volume, we can calculate the mass in grams by multiplying the volume in liters by the density.
First, convert the volume from milliliters to liters: 0.0260 mL is equal to 0.0000260 liters. Then, multiply by the density of helium:
0.0000260 liters × 0.1785 g/L = 0.004642 grams or approximately 0.00464 grams.
None of the options provided (a) 0.067 g, (b) 0.072 g, (c) 0.078 g, (d) 0.082 g match the calculated value. Therefore, there might be an error in the options given or a misunderstanding in the question details.