Answer:
.67 L
Explanation:
.030 mol x 22.4 L / 1 mol = .67 L
22.4 was used because that is what 1 mol equals for a gas at stp.
Answer:
6.022 × 10²³ molecules of B₂H₆
Explanation:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
B₂H₆ molecules:
21.63 g = one mole of B₂H₆= 6.022 × 10²³ molecules of B₂H₆
Moles = grams/molar mass
Moles = 85/(1+35.5)
Moles = 2.33
Multiply by agrovados number (6.022 * 10^23) to get
1.401917808219x10^24 molecules
C is the answer
Hope this helped :)
1. Make sure it isnt something other than a ghost(i.e. something falling)
2. Record what you see and hear
3. See if anyone hears the same thing as you(unless your home alone)
4. Be confident and dont be fearful because ghost sense fear
5. Pray or perform an exorsism( if this is part of your religion)
6. After the ghost leaves, clean up.( like literally mops the floors and stuff. it keeps the ghosts out)
Good Luck ! :]
