Perform the following conversions.

1. 11.5 g C₂H₅OH into moles.

2. 1.20 x 10²⁵ molecules of NH₃ into moles and into grams.

3. 10.0 g Ca into atoms.

4. 7.74 x 10²⁶ formula units TlI into moles.

5. 0.943 mol H₂O into molecules.

6. 50.4 g CaBr₂ into moles.

7. 91.9 g Ag₂Te into formula units.

8. 6.63 x 10²³ formula units Mg(CH₃COO)₂ into grams.

9. 0.638 mol Ce₂(CO₃)₃ into grams.

10. 6.77 x 10²⁴ formula units Ca(ClO₄)₂ into moles.

11. 53.1 g HBr into moles.

12. 4.06 mol SiH₄ into molecules.

13. 64.3 g Rb₂SeO₄ into moles.

14. 3.33 x 10²⁵ molecules I₂ into grams and atoms.

15. 0.846 mol HF into molecules.

16. 39.8 mol CO₂ into molecules.

17. 308 formula units MnC₂O₄ into moles.

18. 1.5 g calcium carbonate into moles.

19. 34.6 mol sodium sulfate into grams.

20. 500 grams potassium chloride into moles.

21. 40 g C₃H₈ into moles.

22. 325 g C₆H₄CH₃COOCOOH (acetylsalicyclic acid - Aspirin) into moles.

23. 150 g CH₃CH₂OHCH₃ (rubbing alcohol) into moles.

24. 4.22 mol ammonia into grams.

25. 0.224 mol sodium hydroxide into grams.

26. 57.3 mol water into grams.

27. 9.44 mol potassium permanganate into grams.

28. 0.77 mol ammonium sulfate into grams.