The scientific form is
So, the form of scientific notation is
Answer : The moles of methane gas could be, 
Solution :
According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.
or,
![[\frac{(\frac{n_1}{t_1})}{(\frac{n_2}{t_2})}]=\sqrt{\frac{M_2}{M_1}}](https://tex.z-dn.net/?f=%5B%5Cfrac%7B%28%5Cfrac%7Bn_1%7D%7Bt_1%7D%29%7D%7B%28%5Cfrac%7Bn_2%7D%7Bt_2%7D%29%7D%5D%3D%5Csqrt%7B%5Cfrac%7BM_2%7D%7BM_1%7D%7D)
where,
= rate of effusion of fluorine gas
= rate of effusion of methane gas
= moles of fluorine gas = 
= moles of methane gas = ?
= time = 12.3 min (as per question)
= molar mass of fluorine gas = 38 g/mole
= molar mass of methane gas = 16 g/mole
Now put all the given values in the above formula 1, we get:
![[\frac{(\frac{5.13\times 10^{-3}mol}{12.3min})}{(\frac{n_2}{12.3min})}]=\sqrt{\frac{16g/mole}{38g/mole}}](https://tex.z-dn.net/?f=%5B%5Cfrac%7B%28%5Cfrac%7B5.13%5Ctimes%2010%5E%7B-3%7Dmol%7D%7B12.3min%7D%29%7D%7B%28%5Cfrac%7Bn_2%7D%7B12.3min%7D%29%7D%5D%3D%5Csqrt%7B%5Cfrac%7B16g%2Fmole%7D%7B38g%2Fmole%7D%7D)
Therefore, the moles of methane gas could be,
Answer:
M is Li, X is boron, and Q is oxygen. MX is LiB, lithium bromide. QX is BO, boron oxide (not Body Odor).
Explanation: The atomic masses don't match exactly with those listed in the periodic table. Boron, Oxygen, and Lithium come the closest.
Lithium reacts with bromine since it happily donates it's single 2s electron to bromine's 4p orbital to fill bromine's 4s and 4p valence orbitals to go from 7 to 8 valence electrons, it's happy state.
Boron reacts with oxygen to form B2O3, which I'll happily write as O=BOB=O, since my name is Bob. This is more complex, but both elements want to move electrons around in order to reach a more stable electron configuration. Boron has 3 valence electrons and oxygen has 6. So each oxygen needs 2 electrons to fill it's outer shell and boron is happy to lose it's 3 valence electrons to reach an outer shell equiovalent to helium. So 2 borons contribute a total of 6 electrons, and the 3 oxygens have room for a total of 6 electrons to fill their outer shell.
Answer:
A. boiling point
Explanation:
The correct answer is;
A. boiling point
The boiling point of a liquid is the temperature at which the vapour pressure is equal to the atmospheric pressure.
B. melting point
This option is wrong because the melting point is the temperature at which a solid undergoes a phase change to a liquid.
C. freezing point
This option is wrong because the freezing point is the temperature at which a liquid undergoes a phase change to a solid.
