For the manufacture of semiconductor batteries, ultrapure silicon is used. The mass fraction of impurities

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:
ω Art. (approx.) <= 0.0000000001%
m1 (Si) = 30 kg = 30,000 g
m1 (approx.) = 0.03 mg = 0.00003 g

To find:
ω1 (approx.) -?

Decision:
1) Calculate the mass fraction of impurities in a given Si sample:
ω1 (approx.) = m1 (approx.) * 100% / m1 (Si) = 0.00003 * 100% / 30000 = 0.0000001%;
2) Compare the obtained mass fraction of impurities with the standard:
ω1 (approx.)> ω st. (approx.);
0.0000001%> 0.0000000001%;
3) This Si sample does not meet the requirements.

Answer: This Si sample is not suitable for making semiconductor batteries.