3......................................
Answer:
That is true. Hope you find it very useful.
True
Explanation:
Lead is the stable form of uranium 238. Lead-206 is a product of radioactive decay of unstable uranium 238 isotope.
- Atomic nucleus have a specific neutron/proton ratio that ensures their stability.
- Nucleus whose proton/neutron ratio is different from that of its stability ratio will be unstable and split into other nuclei.
- This splitting is accompanied with emission of small particles of matter and or electromagnetic radiation.
- Unstable uranium -238 undergoes 14 radioactive decays to produce a stable form which is Pb-206
Learn more:
Nuclear reactions brainly.com/question/10094982
#learnwithBrainly
Answer:
26.5 g
Explanation:
First we convert 100.0 mL to L:
- 100.0 mL / 1000 = 0.100 L
Now we <u>calculate how many moles of sodium carbonate are needed</u>, using the <em>definition of molarity</em>:
- Molarity = moles / liters
- moles = molarity * liters
- 2.5 M * 0.100 L = 0.25 mol
Finally we <u>convert 0.25 moles of sodium carbonate into grams</u>, using its <em>molar mass</em>:
- 0.25 mol * 106 g/mol = 26.5 g
The number is is surely 1