Answer:
C. 30.0 g NaOH and add water until the final solution has a volume of 3.00 L.
Explanation:
Molarity of a substance , is the number of moles present in a liter of solution .
M = n / V
M = molarity
V = volume of solution in liter ,
n = moles of solute ,
from the question ,
M = 0.250M
V = 3.00 L
M = n / V
n = M * v
n = 0.250M * 3.00 L = 0.75 mol
Moles is denoted by given mass divided by the molecular mass ,
Hence ,
n = w / m
n = moles ,
w = given mass ,
m = molecular mass .
From the question ,
n = 0.75 mol NaOH
m = molecular mass of NaOH = 40 g/mol
n = w / m
w = n * m
w = 0.75 mol * 40 g/mol = 30.0 g
Hence , by using 30.0 g of NaOH and dissolving it to make up the volume to 3 L , a solution of 0.250 M can be prepared .
Answer:
4.5 times 10 = 45
Explanation:
"Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant."
Equation balance:
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
2Al(OH)3+3H2SO4
H=12
SO4=3
O=6
Al=2
Al2(SO4)3+6H2O
H=12
SO4=3
O=6
Al=2
The correct wave that matched its definition is:
- Transverse Wave - A wave that has a disturbance that is perpendicular to the wave motion. The wave motion is moving side to side, the energy will be moving up and down.
-
Longitudinal Wave - The disturbance is parallel to the wave motion. In a longitudinal wave, the energy, and the motion
A wave is known to be a disturbance that travels through a medium and transfers energy from one point to another without causing any permanent displacement of the medium itself.
We have two forms of wave namely the transverse waves and the longitudinal waves.
When the vibration of a medium is perpendicular to the wave direction, the kind of wave formed is known as a transverse wave.
When the vibration of a medium is parallel to the wave direction, the kind of wave formed is known as a longitudinal wave.
Learn more here: brainly.com/question/15923236
