300cm³ of a gaseous hydrocarbon diffuses through a porous pot in 450 seconds. The same volume of hydrogen can diffuse in 115 seconds under the same condition. Calculate the molar mass of the hydrocarbon (H=1)

The clouds are grey and ground is wet. a quantitative b qualitative

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.