A fictitious element X is composed of 25.0 percent of the isotope "x, 30.0 percent of the isotope *x, and 45.0 percent of the isotope **x. Estimate the atomic mass of element X.

Agas diffuses 1/7 times faster than hydrogen gas (h2). what is the molar mass of the gas? 100.10 g/mol 98.78 g/mol 86.68 g/mol 79.98 g/mol

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots

Explain that newton first law,second law and third law of motion?