The reaction X → products is second order in X and has a rate constant of 0.035 M−1s−1. If a reaction mixture is initially 0.45 M in X, what is the concentration of X after 155 seconds?

The concentration of X after 155 seconds is 0.13 M

Explanation:

Integrated rate law for second order kinetics is given by:

= initial concentration = 0.45 M

a= concentration left after time t = ?

k = rate constant =

t = time of decmposition = 155 s

Thus the concentration of X after 155 seconds is 0.13 M

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

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