CALCULATE THE LITERS OF PHOSPHINE (PH3) FORMED WHEN 0.45 LITERS OF HYDROGEN REACTS WITH PHOSPHORUS. Py+ 6H2 4PH 3 0.3
0.6
0.9
1.8​

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck

Conservation efforts have been effective in "increasing the number of endangered species, reducing all the negative impacts of human activity, and preserving wildlife habitats".hope my answer has you : ) 

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Is a renewable energy source that's highly environmentally friendly.hope this is what you're looking for. have a great day! : d