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  • Chem Help?

    At what temperature does 1.00 atm of He gas have the same density as 1.00 atm of Ar gas at 273 K?

    1.78 K

    27.4 K

    87.0 K

    273 K

    1 AnswerChemistry2 years ago
  • Please Check?

    In an atmospheric pressure of 747 torr, an open manometer showed the mercury in the arm connected to a cylinder of carbon dioxide gas to be 126 mm Hg higher than the other arm. What is the pressure in the gas cylinder?

    747 torr

    873 torr

    621 torr

    126 torr-my answer

    1 AnswerChemistry2 years ago
  • Please Help?

    Propane, C3H8, reacts with excess oxygen to produce carbon dioxide gas and water. What volume of CO2, measured at 23°C and 0.718 atm, is produced from the reaction of 8.1 g of C3H8 with excess oxygen?

    0.697 L

    1.87 L

    18.7 L

    0.577 L

    1 AnswerChemistry2 years ago
  • Please Help?

    What is the molarity of an H2SO4 solution if 19.0 mL of the solution are completely titrated by 38.4 mL of an NaOH solution with a concentration of 0.212 M? (You will need to write a balanced chemical equation because this titration is NOT 1:1.)

    0.428 M

    0.214 M

    0.857 M

    0.0525 M

    1 AnswerChemistry2 years ago
  • Help with Chem?

    If 102 mL of 0.845 M NaOH completely titrates 112 mL of H3PO4 solution, what is the molarity of the H3PO4 solution? (You will need to write a balanced chemical equation because this titration is NOT 1:1.)

    0.257 M

    0.770 M

    0.3097 M

    2.31 M

    1 AnswerChemistry2 years ago
  • Please Help?

    What volume of 0.3505 M NaOH is necessary to titrate 40.00 mL of 0.1896 M acetic acid?

    10.94 mL

    21.64 mL

    16.40 mL

    26.20 mL

    2 AnswersChemistry2 years ago
  • Chem Help?

    Why do acid-base indicators change colors?

    They are weak acids and change colors when the hydrogen is removed from the indicator molecule.

    They are weak acids and change colors when the hydrogen is added to the indicator molecule.-my answer

    They are strong acids and change colors when the hydrogen is added to the indicator molecule.

    They are strong acids and change colors when the hydrogen is removed from the indicator molecule.

    2 AnswersChemistry2 years ago
  • Please Help?

    At what point in an acid-base titration are equivalent quantities of hydronium ions and hydroxide ions present?

    at the beginning point

    at the midpoint

    at the end point

    throughout the titration- my answer

    2 AnswersChemistry2 years ago
  • Chemistry Check?

    Compound A reacts with compound B in the reaction 2A + 3B → C with a rate law of rate = k[A]2. What is the rate order with respect to compound A?

    2-my answer

    1

    0

    3

    8.

    Compound A reacts with compound B in the reaction 2A + 3B → C with a rate law of rate = k[A]2[B]. What is the rate order with respect to compound A?

    0

    1

    2-my answer

    3

    1 AnswerChemistry2 years ago
  • Help with Chemistry?

    If the system 2CO(g) + O2(g) ⇌ 2CO2(g) has come to equilibrium and then CO(g) is removed, what will happen to the [CO2] and [O2]?

    The [CO2] will increase and the [O2] will decrease.

    The [CO2] will increase and the [O2] will increase.

    The [CO2] will decrease and the [O2] will increase.

    Both the [CO2] and the [O2] will remain the same.

    1 AnswerChemistry2 years ago
  • No idea what to do (Chemistry)?

    What will happen if the nitrogen gas concentration increases on the equilibrium system N2(g) + O2(g) ⇌ 2NO(g)?

    The quantity of O2(g) will increase.

    The quantity of NO(g) will increase.

    The quantity of NO(g) will decrease.

    The quantities in the system will not change.

    1 AnswerChemistry2 years ago
  • Help With Chem?

    Calculate the [OH–] if the hydrogen ion concentration is 9.12 x 10–6 M.

    1.10 x 10–9 M

    5.04

    8.96

    9.22 x 10–9 M

    1 AnswerChemistry2 years ago
  • Chem Check???

    What is the pH of .75 M aqueous acetic acid? (Ka of CH3COOH = 1.8 x 10–5)

    0.547

    2.43

    4.32

    4.88-my answer

    What is the H3O+ concentration in 1.26 M NH4+(aq)? (Ka of NH4+ = 5.6 x 10–10)

    7.1 x 10–10 M

    1.2 x 10–9 M

    2.7 x 10–5 M-my answer

    3.36 x 10–5 M

    2 AnswersChemistry2 years ago
  • Chem Help??

    What is the [OH–] of an aqueous solution with a pH of 6.51?

    3.2 x 10–8 M

    3.1 x 10–7 M-my answer

    5.1 x 10–5 M

    7.5 M

    Calculate the [H+] in a solution that has a pH of 8.15.

    5.85 M

    8.15 M

    7.1 x 10–9 M-my answer

    1.4 x 10–6 M

    1 AnswerChemistry2 years ago
  • Chemistry Help???

    What is the [H+] in 0.040 M HBrO? Ka = 2x 10–9

    8.00 x 10–11 M.

    8.94 x 10–6 M-my answer

    2.00 x 10–9 M

    2.24 x 10–4 M

    2 AnswersChemistry2 years ago