# 1986 Yamaha 70 motor weight?

The dry weight of a 1986 model, 70 hp Yamaha outbord is 235 lbs.

### What size outboard trolling motor for your 18ft boat?

You will need the weight of your boat in lbs, the weight of the people & kit it is expevted to carry and then divide by 70. This will give you the thrust in lbs. For example a total weight of 2500lbs divided by 70 = 35.71, round this up to the nearest whole number is 36. Therefore a trolloing motor of 36lbs thrust is required. Bryan1324

### How much chromium is in a 70 percent by weight concentration of sodium dichromate?

Cr2Na2O7 Atomic Weight Cr - 51.996 Atomic Weight Na - 22.98977 Atomic Weight O - 15.9994 Atomic Weight Cr2Na2O7 - 261.96734 Atomic Weight Cr2 - 103.992 at 100% concentrationCr2 - Cr2Na2O7 = (103.992/261.96734)*100 = 39.70% Cr in Cr2Na2O7 at 70% concentration = 39.70*70%= 39.70*.70 = 27.79% Cr in Cr2NaO7 at 70% concentraion.