The element aluminum has an atomic number of 13. How many protons are in the nucleus of an aluminum atom?
1 answer:
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Answer:
Q = -22.9 kJ
Explanation:
Given that,
Mass of water, m = 150.3 g
Water gets cool from 25.60°C to -10.70°C.
The specific heat of water, c = 4.2 J/g°C
The formula for heat needed is given by :
So, 22.9 kJ of heat is needed to be removed to cool.
Answer:
One urea molecule can make hydrogen bonding with 8 water molecules
Explanation:
- Hydrogen bonding takes place between lone pair of electronegative atoms (O,N and F) and H atom attached with those electronegative atoms.
- Draw the lewis structure of urea and determine how many lone pairs and H atoms are available for hydrogen bonding formation.
- Theoretically one urea can make hydrogen bonding with 8 water molecules.
- Representation of hydrogen bonding has been given below.
