<u>Answer:</u> The mass of sample A after given time is 99.05 g.
<u>Explanation:</u>
All the radioactive reactions follows first order kinetics.
The equation used to calculate half life for first order kinetics:
We are given:
Putting values in above equation, we get:
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant =
t = time taken for decay process = 84.2 s
= initial amount of the reactant = 250 g
[A] = amount left after decay process = ?
Putting values in above equation, we get:
Hence, the mass of sample A after given time is 99.05 g.
<span>1. If equal moles of acid and base react in a neutralization reaction, they cancel out many of each other's properties.
Answer is True.
2. </span><span>A neutral salt is formed by which type of reaction?
Answer is B.
3. </span><span>Which could be the original acid and base that react to produce the salt KCl?
Answer is A.
4. </span><span>Net ionic equations for strong acid-strong base reactions are always: H+ (aq) + OH−(aq Imported Asset H2O (l).
Answer is True.
5. </span><span>Which net ionic equation best represents a weak acid-strong base reaction?
Answer is A.
6. </span><span>The equation, H2SO4 (aq) + Sr(OH)2 (aq) Imported Asset SrSO4 (aq) + H2O (l), represents:
Answer is B.
7. </span><span>When choosing which indicator to use in a titration reaction, you should consider:
Answer is </span><span>the relative strengths of the acid and base you are using in the titration
</span><span>
8. </span><span>When a small amount of acid is added to a buffer, the weak base form of the buffer is converted to:
Answer is C.
9. </span><span>Buffers are systems that resist changes in pH by converting strong acids or bases to weak acids or bases.
Answer is True.</span>
Answer:
if it is espresso(1 shot), the coffee content to be considered is: (77/44)*(10/3)= 5.833= 0.005833 grams
Explanation: