Answer:
Jane has 2.77 * 10^20 molecules cholesterol in 1 dL of blood
Explanation:
<u>Step 1:</u> Given data
Molar mass of Cholesterol = 386.654 g/mol
Jane has a cholesterol of 178 mg/dL
<u>Step 2:</u> Calculate mass of cholsterol in 1 dL
178 mg/dL means in 1 dL she has 178 mg cholesterol or 0.178 grams
<u>Step 3</u>: Calculate number of moles of cholesterol
Number of moles = mass of cholesterol / molar mass of cholesterol
Number of moles = 0.178 grams / 386.654 g/mol = 4.6 * 10^-4 moles
<u>Step 4: </u>Calculate number of molecules
Number of molecules = 4.6 * 10^-4 mol * 6.022 *10^23 / mol = 2.77 * 10^20 molecules
Jane has 2.77 * 10^20 molecules cholesterol in 1 dL of blood
The math is set up like
35.6 ml * 2.7 g/ 1 ml
which will leave you with
96.12 g
Answer:
Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged. ... Because of this shielding, the smoke detector poses no radiation health risk when they are properly handled.
Explanation:
Hope this helped! :D