The right answer is Balanced
Hello!
This question can be easily solved using the
Mole Ratio of KNO₃/KI in the balanced reaction that is shown below:
2KI + Pb(NO₃)₂ → 2KNO₃ + PbI₂
The Mole Ratio of KNO₃/KI in this reaction is
2 moles KNO₃/ 2 moles KI so we can apply the following conversion factor:
So, if 0,03 moles of KI are completely consumed,
0,03 moles of KNO₃ are formed.
Have a nice day!
A scientist needs to check several parameters before coming
to a conclusion about the amount of water pollution. The scientists needs to
check the amount of dissolved oxygen in the water, temperature of the water,
the clarity of the water, the PH level of the water and also the amount of
bacteria present in the water. There may be other criteria’s, but the mentioned
ones are enough to gauge the amount of pollution in the water. Scientists often
takes fish and aquatic plants from the water to be tested to check the amount
of pollution indirectly affecting these species.
Answer:
9.4g
Explanation:
Given parameters:
Volume of hydrogen gas at STP = 15L
Unknown:
Mass of solid lithium = ?
Solution:
The reaction equation is shown below;
2Li + 2H₂O → 2LiOH + H₂
To solve this problem, lets work from the known to the unknown. The known here is hydrogen gas;
At STP;
number of moles = = = 0.67mole
From the balanced reaction equation;
1 mole of hydrogen gas is produced from 2 moles of Li;
0.67 moles of hydrogen will be produced from 0.67 x 2 = 1.34moles
Mass of solid lithium = number of moles x molar mass
= 1.34 x 7
=9.4g