Nicotine, a component of tobacco, is composed of c, h, and n. a 2.625-mg sample of nicotine was combusted, producing 7.1210 mg of co2 and 2.042 mg of h2o. what is the empirical formula for nicotine?

The mass sample of nicotine combusted = 2.625 mg  (given)

Mass of produced = 7.1210 mg  (given)

Mass of produced = 2.042 mg  (given)

Molar mass of = 44 g/mol

Molar mass of = 18 g/mol

Percentage of Carbon = %

Percentage of hydrogen = %

Now, for percentage of nitrogen = %

Calculating the moles of each element:

Dividing with the smallest mole value to calculate the molar ratio of each element:

Hence, the empirical formula for nicotine is .

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )