help!!!!!

1. A sample of air was found to contain 21% oxygen by volume. how many ml of oxygen are present in 2.0 L of air?

2. A 25.0g solution containing salt and water is 2.2% salt by mass. what is the mass (in g) of salt in the solution?

please show me how to solve :)

  1. 👍 0
  2. 👎 0
  3. 👁 152

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A solid fuel was fired in the furnace supplied with 27 kmol of air. After the batch process, 3 kmol of excess oxygen was found in the dry stack gas, how many kilograms of carbon in the fuel were used up? Air is composed of 21%

  2. chemistry

    A sample of oxygen occupies 1.00 L. If the temperature remains constant and the pressure on oxygen is decreased to one-third the orginal pressure, what is the new volume?

  3. Chemistry

    At 298 K, the Henry\'s law constant for oxygen is 0.00130 M/atm. Air is 21.0% oxygen.At 298 K, what is the solubility of oxygen in water exposed to air at 1.00 atm? At 298 K, what is the solubility of oxygen in water exposed to

  4. chemistry

    Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this

  1. science

    You burn 6 grams of carbon in plenty of air: C ( s) + O2 ( g) = CO2 ( g) a What volume of gas will form (at rtp)? b What volume of oxygen will be used up?

  2. statistics

    An important indicator of lung function is forced expiratory volume(FEV), which is the volume of air that a person can expire in one second. Dr. Jones plans to measure FEv in a random sample of n young women from a certain

  3. CHEMISTRY.....AND THIS IS IMPORTANT

    2. If air is 20.9% oxygen by volume, a. how many liters of air are needed for complete combustion of 25.0 L of octane vapor, C8H18? b. what volume of each product is produced? 25L C8H18 x (25 mol O2/2 mol C8H18) = 312.5 L O2 (if

  4. Science

    If a mineral sample has a mass of 10 g, how many grams of oxygen does it contain? You need more information than that to determine the amount of oxygen or any other element in the mineral. Your question is the same kind as, "My

  1. chemistry

    A 2.45 gram sample of potassium chlorate is heated an the oxygen gas collected. what is the volume of the oxygen at STP. Is the oxygen gas itself 2.45 grams or do I have to subtract something from that?

  2. Chemistry

    A sample of oxygen gas has a volume of 8.00 L at 20.0 ° C and 700. torr. How many moles does the sample contain?

  3. statistics

    A simple random sample of a size n is drawn from a population that is normally distributed. The sample mean, x is found to be 110, and the sample standard deviation, s, is found to be 10. A- Construct a 95% confidence interval

  4. chemistry

    Air consits of 21% oxygen, 78% nitrogen and 1% argon by volume. Calculate the partial pressures in Pa if total pressure is 1 atm. My teacher just converted 1atm in pa and then did 21% of that for oxygen etc etc. Can you explain

You can view more similar questions or ask a new question.