Answer:
Moles = Mass / Mr
Moles = Concentration x Volume
Explanation:
Moles can be worked out in several ways depending on the information you are given. Some of the equations containing moles are:
Moles = Mass / Mr
Moles = Concentration x Volume
Rigid Plastics/Bottles. - Any plastic bottles or containers found in your kitchen.
Paper and Cardboard. - Cereal/snack cardboard boxes. ...
Metals. - Tin, aluminum, and steel cans.
Glass. - Food containers or jars. ...
Loose Plastic Bags. - Plastic shopping bags. ...
Polystyrene Foam Cups or Containers. ...
Soiled Food Items. ...
Other.
DescriptionRecycling is the process of converting waste materials into new materials and objects. It is an alternative to "conventional" waste disposal that can save material and help lower greenhouse gas emissions.
Sorry if this is incorrect :(
While most constellations are only visible to us in different seasons, some are always there 24/7/365 because they are positioned close to the Polar Axis, or the Polaris.
Answer:
1.85 g
Explanation:
The strategy here is to utilize the Henderson-Hasselbach equation
pH = pKa + log [A⁻] / [HA]
to calculate the ratio log [A⁻] / [HA], and from there to calculate the concentration [A⁻] and finally the mass of NaNO₂ from the number of moles assuming the final buffer volume is 50.0 mL ( that is the volume does not change by the addition of NaNO₂)
pH = pKa + log [NO₂⁻]/[HNO₂]
3.13 = 3.40 + log [NO₂⁻]/[HNO₂]
- 0.27 = log [NO₂⁻]/[HNO₂]
taking the inverse log function to both sides of this equation
0.54 = [NO₂⁻]/[HNO₂]
Now [HNO₂] = 1.0 M, therefore [NO₂⁻] = [NaNO₂] =
0.54 x 1.0 M = 0.54 M
from M = mol / L we get
mol = 0.54 mol/L x 0.050L = 0.027 mol
the molar mass of NaNO₂ is = 68.99 g / mol, so the mass of 0.027 mol is
0.027 mol x 68.99 g/mol = 1.85 g