It is hard to say . . . it depends on whether the yarn is fine, bulky, or somewhere in the middle.
You can't work the length out from the weight, as different yarns have different thicknesses. If you have a ball band it should give the length.
There should be 836 yards in a package of 16oz of yarn.
They can't be compared. A yard is a distance, an ounce is a weight. The length of 2 ounces of yarn would depend upon the thickness of the yarn and the type of material the yarn is made of (lambs wool, acrylic, etc). I have had some luck when substituting a yarn with a replacement that was an equivalent grams per meter (ounces per yard).
it varies by company , type of yarn ( like wool , acrylic, blends, etc) but as a rule it would be around 200 yards up to about 275 yards . at 200 yards you would be figuring safe
About 1.7 to 1.9 ounces. http://www.crochet-world.com/blog/?p=7272
You can not determine how many yards from the weight of the skein or cone. 50 grams is 1.75 ounces but it would depend on the exact thickness and type of yarn to know how many yards. The thicker the yarn the less the yards as a rule. Example a 50 gram ball of sport yarn can be anywhere from 110 to 170 yards give or take , but a 50 gram ball of bulky can be anywhere from 30 yards to 60 yards give or take ..
It will depend on the type of yarn. 225 yards of worsted weight yarn is about 100g, but 225 yards of sock weight yarn is about 25g. What is the yarn type?
It should be 418 yards long.
A very stiff type of yarn
4 yards.
It depends very much on the bulk and type of yarn.
Depends on the yarn. There is yarn that is 100% cotton, but cotton/rayon mixes and other mixes are common.
It's very slightly less than 175 yards.