Formaldehyde, CH₂O, is the simplest aldehyde and is commonly used as an embalming fluid. Calculate the mass of 8.16 × 10²⁴ molecules of formaldehyde. A) 451 g B) 407 g C) 0.451 g D) 246 g E) 24.6 g

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The molar mass of formaldehyde can be found by summing up the atomic masses of its constituents: Molar mass of CH₂O = 1 × 12.01 + 1 × 1.01 + 1 × 15.99 = 30.03 g/mol To find the mass of 8.16 × 10²⁴ molecules of formaldehyde, we first need to convert this number of molecules to moles: n = N/NA = 8.16 × 10²⁴/6.022 × 10²³ = 1.356 mol Finally, we can use the molar mass to find the mass of the given number of molecules of formaldehyde: m = n × M = 1.356 mol × 30.03 g/mol = 40.80 g Rounding off to three significant figures, the answer is 40.8 g, which is closest to option B (407 g).

Formaldehyde, CH2O, Is the Simplest Aldehyde and Is Commonly Used

Formaldehyde, CH₂O, Is the Simplest Aldehyde and Is Commonly Used