First find how many ml of oil Mason adds by multiplying the volume of the bowl by the proportion filled with oil: 150 ml * 2/3 = <<150*2/3=100>>100 ml
Then repeat the process to find how many ml of vinegar he added: 150 ml * 1/3 = <<150*1/3=50>>50 ml
Now find the weight of the oil by multiplying the volume by the weight/volume ratio: 100 ml * 5 g/ml = <<100*5=500>>500 g
Do the same procedure with the weight and weight/volume ratio of the vinegar to find its weight: 50 ml * 4 g/ml = <<50*4=200>>200 g
Now add the weight of the oil and the vinegar to find the weight of the salad dressing: 500 g + 200 g = <<500+200=700>>700 g
#### 700