In a first-order decomposition reaction. 25.5% of a compound decomposes in 11.3 min. how long (in min) does it take for 82.3% of the compound to decompose?

66.5 min does it take for 82.3% of the compound to decompose.

Explanation:

Using integrated rate law for first order kinetics as:

Where,  

is the concentration at time t

is the initial concentration

Given:

25.5 % is decomposed which means that 0.255 of is decomposed. So,

= 1 - 0.255 = 0.745

t = 11.3 min

k = 0.02605 min⁻¹

Also,  

Given:

82.3 % is decomposed which means that 0.823 of is decomposed. So,

= 1 - 0.823 = 0.177

t = ?

t = 66.5 min

66.5 min does it take for 82.3% of the compound to decompose.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6