Temp change = Q/(mass x sph)
Temp change =57/(22 x .903)
Temp Change = 2.97 ∘C
Temp change 3.0 ∘C
Answer:
Molarity is a unit that measures how much moles of solute dissolved in a liter of solvent. Molarity expressed using capital M while molarity, a different unit, expressed using lower case m.
We want to make 0.005 M solution which means we need 0.005 moles of KmnO4 per liter of water. First, we have to calculate how many grams of KMnO4 we need for the solution.
We want to make 250ml solution, so the number of moles of KMnO4 we need will be: 0.005 mol/liter *(250 ml * 1liter/1000ml)= 0.005 mol/liter * 1/4 liter = 0.00125 moles
The molecular mass of KMnO4 is 158g/mol, so the mass of KMnO4 we need will be: 0.00125 moles * 158g/mol= 0.1975 grams
We know that we need 0.1975 g of KMnO4, now we weigh them and put it inside a dish. After that, we prepare Erlenmeyer or a volumetric flask filled with water half of the volume needed(125ml). Pour the weighted solute into the flask, stir until all solute dissolved.
Then we add water to the container slowly until its volume reaches the 250ml mark.
2. amount of sunlight
3. plant growth
4. x axis- amount of sunlight. y axis- plant growth
5. A bar graph would best represent the data the students found because they are used to compare things between different groups.
Answer:
The limiting reactant is NaC₂O₄ and the yield of this reaction is 69.52%.
Explanation:
NaC₂O₄ + UO₂(NO₃)₂ + 3H₂O → UO₂(C₂O₄).3H₂O + 2NaNO₃
m (NaC₂O₄) = 0.4031 g MW = 134 g/mol ∴ n = 3.0 mmol
m (UO₂(NO₃)₂) = 1.481 g MW = 396.05 g/mol ∴ n = 3.74 mmol
m (UO₂(C₂O₄).3H₂O) = 1.073 g MW = 412.094 g/mol ∴ n = 2.60 mmol
The limiting reactant is NaC₂O₄
The yield can be given by (2.60/3.74).100% = 69.52%
A falling person at low altitude will reach terminal velocity after about 12 seconds, falling some 450 m (1,500<span> ft) in that time. He or she will then maintain this speed without falling any faster.</span>
