How many atoms are contained in 0.633 moles of Ni? ( show work)

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Which best explains why an iceberg floats?