Quantitative data because it involves a number (quantity)
<u>Answer: </u>The mass of sample that remained is 0.127 mg
<u>Explanation:</u>
The integrated rate law equation for first-order kinetics:
......(1)
Given values:
a = initial concentration of reactant = 0.500 mg
a - x = concentration of reactant left after time 't' = ?mg
t = time period = 28 s
k = rate constant = 
Putting values in equation 1:
Hence, the mass of sample that remained is 0.127 mg
Answer:
Explanation:
The kPa-kilopascal is the unit of pressure. It was named after Blaise Pascal, a mathematician and physicist.
The kPa is 1000Pa. Kilo stands for 1000. Now what is a pascal?
A pascal is the amount of force(Newton) exerted per unit area.
1Pa = 1Nm⁻²
At the standard atmospheric level, the pressure is 101.325 x 10³ Nm⁻² i.e the atmosphere exerts a pressure of 101.325 x 10³N in an area of a body.
This unit is used to calculate pressure. It can be converted to other units.
The balanced equation is
2Al + 2KOH + 6H2O -----> 2K[Al(OH)4 + 3H2.
From the above we see that 2 moles of K react with 2 moles of Al.
So 2 .94 moles of aluminium will react with 2.94 moles of potassium (answer)
