∆H for given reaction -847kJ
- As it's negative reaction is exothermic
So
2 mol of Al releases 847KJ heat
4 mol Al releases
∆H=-1694KJ
Answer:
10437calories
Explanation:
The following data were obtained from the question given:
M = 347.9g
C = 4.2J/g°C
T1 = 25°C
T2 = 55°C
ΔT = 55 — 25 = 30°C
Q =?
Q = MCΔT
Q = 347.9 x 4.2 x 30
Q = 43835.4J
Converting this to calories, we obtained the following:
4.2J = 1 calorie
43835.4J = 43835.4/ 4.2 = 10437calories
Answer : You can make 4.68 moles of SO₂
Explanation:
Step 1 : Write balanced equation.
S₈ can combine with oxygen to form SO₂ gas. The balanced equation for this reaction is written below.
Step 2 : Find moles of S₈
The formula to calculate mol is
Molar mass of S₈ is 256.5 g/mol
we have 0.585 mol of S₈
Step 3: Use mole ratio to find moles of SO₂
The mole ratio of S₈ and SO₂ can be found using balanced equation which is 1:8
That means 1 mol of S₈ can form 8 moles of SO₂.
Let us use this as a conversion factor to find moles of SO₂
Therefore we have 4.68 moles of SO₂
Complete question is;
When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,
A)the average kinetic energy of molecules increases.
B)the frequency of molecular collisions increases.
C)the rate constant increases.
D)the activation energy increases.
E)the order of reaction increases.
Answer:
B) The frequency of molecular collisions increases.
Explanation:
When we increase number of reactant molecules, the effective collision between the reactant molecules will form a product which also increases. As a result, the overall rate of the reaction will also increase which means the frequency of the molecular collision will also increase as well.
Thus, the correct answer is Option B
Yes. its a chemichal change.
