 # (senior one chemistry) how many moles is 5.4 ml of water at 4 ° C

## (senior one chemistry) how many moles is 5.4 ml of water at 4 ° C

4 ℃ is not the standard condition, so 22.4 cannot be used
5.4 ml is 5.4 cm3. According to the density of water, the mass of water is 5.4G, n = m / M = 5.4 / 18 = 0.3mol

### About atomic mass There is a topic that says: the actual mass of an oxygen atom is about 16 / 6.02 * 10 ^ 23g Is that right? If it is wrong, what should be the correct algorithm?

This statement is wrong. Oxygen has isotopes, oxygen 16 and oxygen 18. The mass of oxygen 16 atom is like this, but oxygen 18 is not. But his calculation method is correct. The molar mass is the mass of 1mol particles (atoms, molecules or ions), so the actual mass of an atom m (atom) = molar mass m / Avogadro constant Na

eight

### The number of electrons in the outermost layer of an element atom is n times the number of electrons in the secondary layer (n > 1). What is the number of protons in the nucleus of the atom The number of electrons in the outermost layer of an element atom is n times the number of electrons in the secondary layer (n > 1). What is the number of protons in the nucleus of the atom It looks like 2n + 2. I listed it with C and O, but is there a simpler method?

Outermost layer up to 8 electrons
The outer layer is 2 electrons or 8 electrons or 18 electrons
Because n > 1, the secondary layer must have 2 electrons
It can be seen that there are 2n + 2 extranuclear electrons
That is, the number of protons in the nucleus

### What is the ratio of atoms At the same temperature and pressure, what is the atomic number ratio of O2 and SO2 gases with equal mass? Lovewwwaaabbb thank you for your answer. I can see your answer in the email, but I can't find your answer here. Baidu may smoke again. When will it be restored~

Take M G, the ratio of the number of molecules is m divided by 32 and M divided by 64 is 2 to 1, then the ratio of the number of atoms is 4 to 3

### The following substances contain the largest number of atoms () A. 0.4mol oxygen B. 5.6 under standard conditions   L carbon dioxide C. 5.4 at 4 ℃   Ml water D. 10g neon

A. 0.4mol oxygen contains 0.8molo atom; B. N (CO2) = 5.6l22.4l/mol = 0.25mol, and the amount of atomic substance is 0.25mol × 3=0.75mol； C. At 4 ℃, 5.4 ml of water, n (H2O) = 5.4g18g/mol = 0.3mol, and the amount of atomic substances is 0.3mol × 3=0.9mol； D．n（Ne）=10g20g/...