The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. ... This chemical series contains helium, neon, argon, krypton, xenon, and radon.
Answer:
24
Explanation:
You read at the bottom of the meniscus or curve and count.
The final temperature in Celsius of the metal block is 49°C.
<h3>How to find the number of moles ?</h3>
Moles water =
=
= 0.0266 moles
Heat lost by water = 0.0266 mol x 44.0 kJ/mol
= 1.17 kJ
= 1170 J [1 kJ = 1000 J]
Heat lost = Heat gained
Heat gained by aluminum = 1170 J
1170 = 55 x 0.903 (T - 25) = 49.7 T - 1242
1170 + 1242 = 49.7 T
T = 48.5°C (49°C at two significant figures)
Thus from the above conclusion we can say that The final temperature in Celsius of the metal block is 49°C.
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Answer:
The common product is H2CO3
Explanation:
Complete question
Which products are the same in both the copper carbonate and the calcium carbonate if they react with hydrochloric acid in different reactions?
Solution
Reaction of copper carbonate and hydrochloric acid is as follows
CuCO3 + 2 HCl --> CuCl2 + H2CO3
Reaction of calcium carbonate and hydrochloric acid is as follows
CaCO3 + 2HCl --> CaCl2 + H2CO3
The common product is H2CO3