A scoop is not a standardized unit of measurement, so it is not possible to say how many grams are in one scoop. A scoop is a utensil that comes in a variety of shapes and sizes. A gram is a unit of mass that is part of the metric system. One gram is equal to the mass of one cubic centimeter of water at 4 degrees Celsius.
In everyday usage, the terms mass and weight can be used interchangeably, although they are actually slightly different scientific concepts. The difference between weight and mass has to do with differences in gravitational pull in different locations. For example, a scoop of flour would have the same mass on Earth as it would if it were on the Moon, but it would not weigh the same amount.
The weight that fits within the volume of a scoop varies based on the density of the material being measured, because mass and volume do not measure the same thing. Mass is the amount of matter an object contains, while volume is the amount of space it takes up. A scoop is a measurement of volume and a gram is a measurement of mass, sometimes used as a measurement of weight.