Chemistry, Help!

a) A 750-mL sample of hydrogen exerts a pressure of 822 torr at 325 K. What pressure does it exert if the temperature is raised to 475 K at constant volume?

b) Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

  1. 👍
  2. 👎
  3. 👁
  1. 1.
    (P1V1/T1) = (P2V2/T2)

    mols = grams/molar mass

    1. 👍
    2. 👎
  2. Answer: 1.20 x 10^3

    Explanation: 822/325 = ?/475

    Isolate the unknown by multiplying both sides by 475/1 (reciprocal). So you divided 822 by 325 and get 2.529230769. You take that and multiply it by 475 and get 1201, which equals1.20 x 10^3.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    When 0.40 g of impure zinc reacted with an excess of hydrochloric acid, 127 mL of hydrogen was collected over water at 10 degress C The external pressure was 737.7 Torr. a) What volume would the dry hydrogen occupy at 1.00 atm and

  2. AP Chemistry

    Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc. Zn(s)+2HCl(aq) -> ZnCl2(aq)+ H2(g) Typically, the hydrogen gas is bubbled through water for

  3. Chem

    A mixture of chromium and zinc weighing .362 g was reacted with an excess of hydrochloric acid. After all the metals in the mixture reacted 225 mL of dry hydrogen gas was collected at 27 C and 750 torr. Determine the mass percent

  4. Chemistry

    A 32.0 mL sample of hydrogen is collected over water at 20.0 degrees celcius and 750.0 torr. What is the volume of the dry gas at STP?

  1. Chemistry

    Some hydrogen gas is collected over water at 20.0 Cel. and the levels inside the container is the same. The partial pressure of hydrogen is 742.5 torr. What is the barometric pressure as the time the gas was collected. My answer

  2. chemistry

    A chemist prepares a sample of hydrogen bromide and finds that it occupies 249 mL at 60◦C and 552 Torr. What volume would it occupy at 0◦C at the same pressure? Answer in units of mL

  3. chemistry

    A 300 mL sample of hydrogen gas is at a pressure of 0.500 kPa. If the pressure increases to 0.750 kPa, what will be the final volume of the sample? Assume that the temperature stays constant

  4. Algebra

    Natasha is planning a school celebration and wants to have live music and food for everyone who attends. She has found a band that will charge her $750 and a caterer whoWill provide snacked and drinks for $2.25 per person. If her

  1. chemistry

    Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g) = CO(g) + 3H2(g) In a particular reaction, 26.5 L of methane gas (measured at a pressure

  2. Chemistry

    A sample of hydrogen gas is collected by water displacement at 20.0'C when the atmospheric pressure is 99.8kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapour is 2.33kPa at that temperature?

  3. Chemistry

    Calculate the percent purity of a sample of zinc metal if 325 mL of hydrogen gas is collected by water displacement at a temperature of 22.0 C and an atmospheric pressure of 745.0 mm Hg when 1.12 g of the sample is reacted with

  4. Chem

    Would you please tell me if these are right? A sample of helium has a volume of 325 ml and a pressure of 655 mm hg. What will be the pressure if the helium is compressed to 125 ml (t and n are constant) I got 1703 mm of Hg A 75.0

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