Which of the following compounds contains twice as many carbon atoms as oxygen atoms? Plz help :)

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

How many grams of n2h4 will be consumed by 23 g of n2o4

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →