Yes, water can stay liquid below zero degrees Celsius. ... When we apply pressure to a liquid, we force the molecules to get closer together. They can therefore form stable bonds and become a solid even if they have a higher temperature than the freezing point at standard pressure.
Answer:
Q = -897 kJ/mol
Explanation:
From the given information:
The heat released Q = -65.9 kJ
To start with the molar mass of = 2 × (molar mass of H) + 2 × (molar mass of O)
= (2 × 1.008) + (2 × 16.0 )
= 34.016 g/mol
However, given that:
mass of 2.50 g
The number of moles of =
Finally; Using the formula:
Q = -897 kJ/mol
Answer:
a) The half life of the radioactive sample is 0.22 years.
b) It will take 0.16 years to sample to decay to 40% of its original amount.
Explanation:
a) Initial amount of radioactive substance =
Final amount of radioactive substance after 1 year=
Decay constant = k
Decaying of radio active sample follows first order kinetics:
Half life of the sample =
The half life of the radioactive sample is 0.22 years.
b)
Initial amount of radioactive substance =
Final amount of radioactive substance after t years=
Decay constant = k =
Decaying of radio active sample follows first order kinetics:
Solving for t:
t = 0.1587 years ≈ 0.16 years
It will take 0.16 years to sample to decay to 40% of its original amount.
Yes you balanced it correctly : CH₃CH₂CH₃ ₍g₎ + 5O₂ ₍g₎ -------> 3CO₂ ₍g₎ + 4H₂O ₍g₎
A hack to checking if its correct when they give you the structural formula of one of the species (CH₃CH₂CH₃) is to convert it to the molecular formula and if you get the same answer then it's correct.
So CH₃CH₂CH₃ is the struct-formula for the molec-formula C₃H₈
C₃H₈ + 5O₂ --------> 3 CO₂ + 4H₂O (which means your correct =D)