For the manufacture of semiconductor batteries, ultrapure silicon is used. The mass fraction of impurities in it should not exceed

For the manufacture of semiconductor batteries, ultrapure silicon is used. The mass fraction of impurities in it should not exceed 0.0000000001%. Is silicon suitable for these purposes, 30 kg of which contains 0.03 mg of impurities?

Given: m (sample) = 30 kg = 30,000,000 mg, m (impurities) = 0.03 mg.
Find: ω (impurities) -?
Decision:
Let’s calculate the mass fraction of impurities in the sample:
ω (impurities) = m (impurities) / m (sample) = 0.03 mg: 30,000,000 mg = 0.000000001, or,
multiplying this value by 100%, we get 0.0000001%.
Answer: no, since ω (impurities) = 0.0000000001%.