Question

A typical carbon monoxide detector will sound it's alarm if it detects 0.050 g of CO, HOw many molecules of carbon monoxide are need to sound the alarm

Answer 1

Answer:

1.07×10²¹ molecules are needed to sound the alarm

Explanation:

Let's convert the mass of CO to moles, to determine the amount of molecules.

0.05 g . 1 mol / 28 g = 1.78×10⁻³ moles

Now we can determine the number of molecules with the NA

1 mol has 6.02×10²³ molecules

1.78×10⁻³ moles may have (1.78×10⁻³ .  6.02×10²³) / 1 = 1.07×10²¹ molecules