Noble Gases (18): (Name all noble gases)
1 answer:
Answer :
- The Noble gasses are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn).
- When air is cold, Oxygen liquefies first at
.
liquefies at
. About 1% of the air is still gas composed of the noble gas Argon, Ar.
- One noble gas was discovered on the sun. It’s spectrum was identify first. This is Helium, He.
- One of noble gas is radioactive and seeps up your basement floors and walls. It is Radon, Rn.
- This noble gas is used in electronic flashes and other bright lights. It is Xenon, Xe.
- This noble gas is best known for its orange color in gas discharge tubes. It is used for signs that bear its name. It is Neon, Ne.
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Answer:
- <u>68.3g</u>
Explanation:
<u>1. Word equation:</u>
- <em>mercury(II) oxide → mercury + oxygen </em>
<u>2. Balanced molecular equation:</u>
- 2HgO → 2Hg + O₂(g)
<u>3. Mole ratio</u>
Write the ratio of the coefficients of the substances that are object of the problem:
<u>4. Calculate the number of moles of O₂(g)</u>
Use the equation for ideal gases:
<u>5. Calculate the number of moles of HgO</u>
<u>6. Convert to mass</u>
- mass = # moles × molar mass
- molar mass of HgO: 216.591g/mol
- mass = 0.315mol × 216.591g/mol = 68.3g