Answer:
We have 2.58 moles toluene in solution
Explanation:
Step 1: Data given
Mass of toluene = 801 grams
Boiling point of the solution = 90.3 °C
Boiling point elevation constant = 2.92 °C/m
Boiling point temperature = 80.9 °C
Step 2: Calculate molality
ΔT = i*Kb*m
⇒with ΔT = the boiling point elevation = 90.3-80.9 = 9.4 °C
⇒with i = the van't Hoff factor = 1
⇒with Kb = the Boiling point elevation constant = 2.92 °C/m
⇒with m = the molality
m = 9.4 °C / 2.92
m = 3.22 molal = moles / kg
Step 3: Calculate moles toluene
Molality = moles tolune / mass cyclohexane
3.22 molal = moles toluene / 0.801 kg
Moles toluene = 2.58 moles
We have 2.58 moles toluene in solution
Mass will increase drastically the GPE since mass since mass is a variable in the formula GPE= mgh. 2.
Rerouting the river won't have an affect on the fish because they can move right along with it. It will have an affect on the animals because when that moves it might leave a little water or none, and some animals can't keep moving like that because of their water supply.
Complete Question:
What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium with excess water according to the following reaction?
Mg + 2H₂O --> Mg(OH)₂ + H₂
Answer:
62 L
Solution:
Step 1: Calculate Moles of Mg as;
Moles = Mass / M.Mass
Moles = 67.3 g / 24.30 g/mol
Moles = 2.76 moles of Mg
Step 2: <u>Calculate Moles of H₂ as;</u>
According to balance chemical equation,
1 mole of Mg produced = 1 mole of H₂
So,
2.76 moles of Mg will produce = X moles of H₂
Solving for X,
X = 2.76 mol × 1 mol / 1 mol
X = 2.76 mol
Step 3: <u>Calculating volume of H₂,</u>
1 mole of ideal H₂ occupies = 22.4 L Volume at STP
So,
2.76 moles of H₂ will occupy = X L of H₂ at STP
Solving for X,
X = 2.76 mol × 22.4 L / 1 mol
X = 61.82 L ≈ 62 L
Answer:
1. 11g
2. 909
Explanation:
To get the Weight of a 109 washers who weigh 0.110g each we have to find the ratio of Weight of one washer to 1 washer and multiply by 100
= 100 washers x 0.110g/1 washer
= 11g
Therefore the mass of 100 washers is 11 grams
2.
Then the number of washers =
100g x 1washer/0.110g
= 909
Therefore number of washers = 909