The number of each type of atom on the right side of the equation
that is
Pb(No3)2(aq) + 2 NaCl(aq) = PbCl2(s) +2NaNo3(aq)
are 1 atom of Pb
2 atoms of N
6 atoms of O
2 atoms of Na
2 atoms of Cl
Explanation
In Pb(NO3)2 there is 1 x1=1 atoms of Pb, 1x2 =2 atoms of N and 3x2 =6 atoms of O
In NaCl there is 2 x1= 2 atoms of Na and 2 x1=2 atoms of Cl
Answer:
The answer to the question is
50 % of the original amount of potassium 40 will be left after one half life or 1.25 billion years
Explanation:
To solve the question we note that the half life is the time for half of the quantity of substance that undergoes radioactive decay to disintegrate, thus
we have
half life of potassium 40 K₄₀ = 1.25 billion years
To support the believe tht the rock was formed 1.25 billion years ago we have
After 1.25 billion years we have
= =0.5 of will be left or 50 % of the original amount of potassium 40 will be left
Explanation:
option 3 is right I. e NA