Question

Решите пожалуйста сколько молей:а) в 4г кислорода О2б)в 10г газа водородав)в алюминиевой чайной ложке массой 18 г?

Answer 1

А)0,125
б)5
в)0,6
кажется,так

Answer 2

Calculation of Moles

To calculate the number of moles in a given substance, we can use the formula:

moles = mass / molar mass

where: - moles is the number of moles - mass is the mass of the substance - molar mass is the mass of one mole of the substance

Let's calculate the number of moles for each case:

a) In 4g of oxygen gas (O2): To calculate the number of moles of oxygen gas, we need to know the molar mass of oxygen. The molar mass of oxygen (O2) is approximately 32 g/mol.

Using the formula, we can calculate the number of moles: moles = mass / molar mass moles = 4g / 32 g/mol moles ≈ 0.125 mol

Therefore, there are approximately 0.125 moles of oxygen gas in 4g.

b) In 10g of hydrogen gas (H2): To calculate the number of moles of hydrogen gas, we need to know the molar mass of hydrogen. The molar mass of hydrogen (H2) is approximately 2 g/mol.

Using the formula, we can calculate the number of moles: moles = mass / molar mass moles = 10g / 2 g/mol moles = 5 mol

Therefore, there are 5 moles of hydrogen gas in 10g.

c) In an aluminum teaspoon with a mass of 18g: To calculate the number of moles of aluminum, we need to know the molar mass of aluminum. The molar mass of aluminum (Al) is approximately 27 g/mol.

Using the formula, we can calculate the number of moles: moles = mass / molar mass moles = 18g / 27 g/mol moles ≈ 0.667 mol

Therefore, there are approximately 0.667 moles of aluminum in an 18g aluminum teaspoon.

Please note that the molar masses used in these calculations are approximate values and may vary slightly depending on the source.