hi im breanna
Answer:
The mole is simply a very large number that is used by chemists as a unit of measurement.
Explanation:
The mole is simply a very large number,
6.022
×
10
23
, that has a special property. If I have
6.022
×
10
23
hydrogen atoms, I have a mass of 1 gram of hydrogen atoms . If I have
6.022
×
10
23
H
2
molecules, I have a mass of 2 gram of hydrogen molecules. If I have
6.022
×
10
23
C
atoms, I have (approximately!) 12 grams.
The mole is thus the link between the micro world of atoms and molecules, and the macro world of grams and litres, the which we can easily measure by mass or volume. The masses for a mole of each element are given on the periodic table as the atomic weight. So, if have 12 g of
C
, I know, fairly precisely, how many atoms of carbon I have. Given this quantity, I know how many molecules of
O
2
are required to react with the
C
, which I could measure by mass or by volume.
Answer:
0
Explanation:
An image of the lewis structure of the compound OF2 is shown in the image attached.
A Lewis structure is a structure in which electron pairs on atoms are shown as dots. Sometimes shared electron pairs are shown by a horizontal straight line connecting the two atoms involved.
OF2 has no double bonds as shown in its structure. It is a compound containing only two O-F sigma bonds and no pi-bonds.
Answer:
D) 8.40 L H₂O(g).
Explanation:
- The balanced equation for the mentioned reaction is:
<em>2N₂H₄(l) + O₂(g) → N₂(g) + 2H₂O(g),
</em>
It is clear that 2.0 moles of N₂H₄ react with 1.0 mole of O₂ to produce 2.0 moles of N₂ and 2.0 moles of H₂O.
- At STP, 4.20L of O₂ reacts with N₂H₄:
It is known that at STP: every 1.0 mol of any gas occupies 22.4 L.
<u>using cross multiplication:
</u>
1.0 mol of O₂ represents → 22.4 L.
??? mol of O₂ represents → 4.2 L.
∴ 4.2 L of O₂ represents = (1.0 mol)(4.2 L)/(22.4 L) = 0.1875 mol.
- To find the no. of moles of H₂O produced:
Using cross multiplication:
1.0 mol of O₂ produce → 2.0 mol of H₂O, from stichiometry.
0.1875 mol of O₂ produce → ??? mol of H₂O.
∴ The no. of moles of H₂O = (2.0 mol)(0.1875 mol)/(1.0 mol) = 3.75 mol.
- Again, using cross multiplication:
1.0 mol of H₂O represents → 22.4 L, at STP.
3.75 mol of H₂O represents → ??? L.
<em>∴ The no. of liters of water vapor will be produced </em>= (3.75 mol)(22.4 L)/(1.0 mol) = <em>8.4 L.</em>
<em></em>
<em>So, the right choice is: D) 8.40 L H₂O(g).</em>
<em></em>
Answer:
the moluculer formula is the answer
Explanation:
speed equals wavelength times frequency so
.7 x 500 = 350
