Calculate the number of molecules contained in: a) 6 g of hydrogen H2 b) 44.8 l of oxygen O2 c) 0.3 mol of water H2O

| September 9, 2021 | education

To solve Problem 1, we write it down: m (H2) = 6 г

Find: N -?

Solution:

Let’s write down the formula for calculating the number of molecules:

N = v * NA

Let’s calculate the amount of substance.

v = m / M

M (H2) = 1 * 2 = 2 g / mol

v = 6/2 = 3 mol

N = 3 * 6.02 * 10 ^ (23) = 18.06 * 10 ^ (23)

To solve problem 2, we write down given: V (O2) = 44.8 l

Find: N -?

Solution:

Let’s write the formula for calculating the number of molecules:

N = v * NA

Let’s calculate the amount of substance.

v = V / Vm

v = 44.8 / 22.4 = 2 mol

N = 2 * 6.02 * 10 ^ (23) = 12.04 * 10 ^ (23)

To solve Problem 3, we write down given: v (H2O) = 0.3 mol

Find: N -?

Solution:

Let’s write down the formula for calculating the number of molecules:

N = v * NA

N = 0.3 * 6.02 * 10 ^ (23) = 1.806 * 10 ^ (23)



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