Cual es la molalidad y fraccion molar de una solución acuosa de acido fosforico al 35,4% en peso.?

What is the mass of 0.46 mol of mgcl2

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.