молярная масса угольной кислоты (Н2СО3) равна......
а) 31 г/моль
б) 62 г
в) 62 г/моль
г) 124 г/мооль

 Вставьте артикли a,an,the, где необходимо.

  1. What .... fine day it is today! 2. .... History and .... Computer Science were .... my favorite subjects at .... school. 3. I don’t know .... way to .... station. 4. He is .... engineer by .... profession. 5. Usually I get up at .... 7 o’clock in .... morning. 6. .... Rostov is on .... right bank of .... Don. 7. Will you have .... cup of .... tea? 8. .... Warsaw is .... capital of Poland. 9. We shall go to .... cinema together with .... our friends. 10. This is .... book, .... book is very interesting. 11. Do you see .... sun in .... sky today? 12. He is .... engineer by .... profession. 13. I went to .... Smirnovs, but they were not at .... home