how can i calculate the number of: 1.molecules in 30g water.2.atoms in 50 dm^3 nitrogen gas.3.nucleons in 10 cm^3 flourine gas?

1. Hint:

One mole of water (18 grams) contains 6.022E23 molecules of H2O).
2. Hint: There are 6.022E23 molecules in 1 mole N2 which occupies 22.4 L at STP and the number of atoms is twice that.
3. Hint:How many moles F2 do you have? That will be 10cc/22,400 = ??
How many F2 molecules do you have? That will be moles x 6.022E23. How many atoms F2 do you have. You will have twice the number of molecules. How many nucleons do you have? There are 9 protons and 10 neutrons in each molecule of F2.

Calculate the total number of ions in 2,0g K2SO4

3.13E23

To calculate the number of molecules, atoms, or nucleons in a given amount of a substance, you will need to use the concept of mole and Avogadro's constant.

1. To calculate the number of molecules in 30g of water:
- Find the molar mass of water, which is 18.01528 g/mol. This value represents the mass of one mole of water molecules.
- Divide the given mass of water (30g) by the molar mass of water to get the number of moles.
Number of moles = 30g / 18.01528 g/mol
- Multiply the number of moles by Avogadro's constant, which is approximately 6.022 × 10^23.
Number of molecules = Number of moles × Avogadro's constant

2. To calculate the number of atoms in 50 dm^3 of nitrogen gas:
- Convert the given volume from dm^3 to liters since 1 dm^3 is equal to 1 liter.
Volume = 50 dm^3 = 50 liters
- Use the ideal gas law equation to calculate the number of moles of nitrogen gas. The ideal gas law equation is:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
In this case, assuming constant temperature and pressure, n = (PV) / RT
Calculate the value of n using the values you have.
- Multiply the number of moles by Avogadro's constant to calculate the number of atoms.
Number of atoms = Number of moles × Avogadro's constant

3. To calculate the number of nucleons in 10 cm^3 of fluorine gas:
- Convert the given volume from cm^3 to liters since 1 cm^3 is equal to 1 milliliter, and 1 liter is equal to 1000 cm^3.
Volume = 10 cm^3 = 10/1000 liters
- Use the ideal gas law equation and the method described in step 2 to calculate the number of moles of fluorine gas.
- Multiply the number of moles by Avogadro's constant to calculate the number of nucleons, which includes the number of protons and neutrons in the atoms of the gas molecules.

Remember to use the appropriate units and constants in your calculations to obtain accurate results.