Answer:
Explanation:
proposed an early model of the atom as a central nucleus containing protons and neutrons being orbited by electrons in shells. As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.
Taking the compound with the metallic counterpart of highest mass would be the answer. Looking at the periodic table, it is easy to realize that K has the highest mass out of H, Li, K, and Cl. Therefore, the answer is (2) KCl.
the molecularity of C12H22O11 is = 12x12+22x1+16x11 = 342 g/mol
molarity (M) = moles / V. solution
moles = mass / 342 = 15,6/342 = 0,0456 moles
=> molarity (M) = 0,0456/0,0655 = 0,696 M
Answer:
The pressure of the gas increases by the four times.
Explanation:
According to the Gay-Lussac's law
The relationship between pressure and temperature is as follows.
\
From the given data, we considered 1 is a initial temperature and 4 is final temperature. Initial pressure is considered as .
Let's find the final pressure of the gas.
Substitute the temperature value.
Therefore, The pressure of the gas increases by the four times.
Answer:
speed of plane in still air = 252 mph
speed of wind = 42 mph.
Explanation:
Given:
Distance travelled by the small plane = 245
Time taken to fly 245 miles = 1 hour and 10 minutes.
Time taken for return trip = 50 minutes.
To Find:
speed of the wind=?
The speed of the plane in still air=?
Solution:
We Know that
=>
=>
=>
=>210 mph against wind
on way back
=>
=>
=>
=> 294
Now
294 = plane +wind------------------------(1)
210 =plane - wind-------------------------(2)
Solving (1) and (2)
2 plane = 504
plane = 252
plane =
So substituting plane value in eq(2) we get,
210 =252 - wind
wind = 42 mph