Answer:
Mg * ignore the division line
Explanation:
Mg has an atomic number of 12.
14 neutrons + 12 protons = mass number of 26
Answer:
ΔH = 200 kJ/mol
Explanation:
Step 1: Data given
activation energy (Ea) is: 450 kJ/mol
activation energy (Ea) of the reverse reaction is 250 kJ/mol
Step 2: The balanced equations
C4H10 ---> C2H6 + C2H4 Ea = 450 kJ/mol
C2H6 + C2H4 ---> C4H10 Ea = 250 kJ/mol
Step 3: Calculate ΔH
Since the reverse reaction has a lower activation energy, this means we need less reaction for the reverse reaction to happen. We can say the reaction absorbs energy, so this is the endothermic reaction.
Ea ( of the forward reaction) = ΔH + Ea (of the reverse reaction)
ΔH = Ea ( of the forward reaction) - Ea (of the reverse reaction)
ΔH = 450 kJ/mol - 250 kJ/mol
ΔH = 200 kJ/mol
Since the reactionis endothermi, ΔH is positive
Answer:
3 moles H₂
Explanation:
The reaction equation Zn + 2HCl => ZnCl₂ + H₂ shows a 1:1 mole ratio between Zn and molecular hydrogen (H₁). Therefore, the moles of Zn consumed in the reaction is then equal to the moles of H₂ produced. In this case using 3 moles Zn => 3 moles H₂ will be produced.
Answer: how many industries and factories are in 'x' country.
Explanation: the main causes of global temperature rising are factories because, harmful gases can be released. And if the number of the factories increase the percentage of the harmful gas that is being released also increases. So to clarify evidence you can ask :- how many factories does country 'x' have?
By the way 'x' means any one country.