The correct answer is compound
The answer is no.(4) They frequently have long half-lives and remain radioactive for extended periods of time
For example, half life of Uranium (U) varies from 25 thousand years to 4.5 billion years
Hey there ! :
<span>2 Na + 2 H2O = 2 NaOH + 1 H<span>2
</span></span>Sodium<span> + </span>Dihydrogen Monoxide<span> = </span><span>Natriumhydroxid</span><span> + </span>Hydrogen
Coefficients:
Reagents : Na = 2
H2O = 2
Products : NaOH = 2
H2 = 1
40 ppm of NaOH
<u>Explanation:</u>
ppm is nothing but the parts per million and it is represented as 1 mg solute per kg of solution.
Here, number of moles of solute (NaOH) can be found as 0.001 mol / L, so we can find the amount of solute as,
Moles =
0.001 mol / L = 
0.001 × 40 = 0.04 g of solute
1 g = 1000 mg
0.04 g = 40 mg
In 1 kg of solution 40 mg of solvent is present.
So the concentration of NaOH is 40 ppm.
Answer:
Well in one glucose they are 6.022*1023 individual glucose molecule.