Answer:
1000 g
Explanation:
Given data:
Initial temperature of water = 45°C
Final temperature of water = 25°C
Heat released = 20 cal (4184×20 = 83680 j)
Mass of water = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.184 j/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 25°C - 45°C
ΔT = -20°C
83680 j = m × 4.184 j/g.°C ×20°C
83680 j = m × 83.68 j/g
m = 83680 j / 83.68 j/g
m = 1000 g
Hi there!
I think populations' safety living near nuclear power plants are compromised. If there were a leak, the poison would have a greater potential to kill people living close to the source than farther away.
I think people should be taught and obtain an escape procedure in the event of a nuclear leak emergency. When a leak near them occurs, it is more likely that they can escape faster.
Hope this helps!
When heating lithium carbonate (Li2CO3), it will dissociate to Li2O and Co2. So the balanced chemical equation of this reaction is Li2CO3 = Li2O + CO2.
Answer:
- <u>Ten (10) molecules of water</u><em> are bonded to sodium sulfate decahydrate.</em>
Explanation:
A hydrated compound is one that contains water molecules chemically bonded. So, the correct question is how many waters are <u><em>bonded</em></u> to sodium suilfate?
The latin prefix<em> deca</em> means ten (10), and the word <em>hydrate </em>means that contains water; then, <em>decahydrate</em> is used in chemistry to designate a compound that is bonded to 10 parts (molecules) of water.
Hence, sodium sulfate decahydrate means that each molecule of the compound is bonded to 10 molecules of water.
In the chemical formula, the water molecules of a hydrated compound are shown after the chemical formula of the compound using a period and a coefficient (the number of water molecules bonded) before the water molecules.
Then, given that the chemical formula for sodium sulfate is Na₂SO₄, the chemical formula for sodium sulfate decahydrate is Na₂SO₄·10H₂O.