How many grams of F2 (Molar Mass: 37.98g/mol) are formed if 4.96 grams of HF REACTING W/ excess O2

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

When a scientific theory has been tested and proved by the scientific community, it becomes a law

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process