Read the given chemical reaction.

c2h6 + o2 → co2 + h2o

how many moles of h2o are produced during the complete combustion of 1.4 moles of c2h6?

2.8 moles
4.2 moles
5.6 moles
7.0 moles

the balanced equation for the combustion of ethane is as follows

2C₂H₆ + 7O₂ --> 4CO₂  + 6H₂O

molar ratio of C₂H₆ to H₂O is 2:6

this means that when 2 mol of C₂H₆ react 6 mol of H₂O are produced

for every 1 mol of C₂H₆ that reacts  thrice the number of  moles of H₂O are produced

therefore when 1.4 mol of C₂H₆ reacts - 3 x 1.4  = 4.2 mol of H₂O are produced

the answer is 4.2 mol

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.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates