Final answer:
Approximately 0.085 moles of gas are present in a balloon holding 1,905.27 ml of gas, assuming standard temperature and pressure (STP) where 1 mole of gas occupies 22.4 liters.
Step-by-step explanation:
If a balloon is holding 1,905.27 ml of gas, to determine the number of moles of gas in the balloon, we apply the ideal gas law. However, the question does not provide information about the temperature and pressure. To solve such a problem, we usually assume standard temperature and pressure (STP), where 1 mole of an ideal gas occupies 22.4 liters. Here's how to convert the volume in milliliters to moles under STP:
Firstly, convert the volume from milliliters to liters:
1,905.27 ml × (1 L / 1,000 ml) = 1.90527 L
Now, use the molar volume of a gas at STP to find the number of moles:
1.90527 L × (1 mol / 22.4 L) = 0.085 mol (rounded to three decimal places)
Therefore, the balloon contains approximately 0.085 moles of gas at STP.