How do You Convert Ounces to Grams?

If the conversion is from U.S. customary ounces to grams then there are 28.3495 grams in an ounce but there are also troy ounces (for measurement of precious metals) and the result can be different as listed below. Weight units ounces to grams conversion table below has the commonly converted numbers. You may also use the converter below (javascript required) to convert any other numbers.

Ounce is a unit of mass in several measurement systems (united states customary, imperial, even customized metric system 25 grams, dutch metric system 50 grams etc). The word "ounce" is also used as a volume unit but then simply meant as "fluid ounces" where it equals to about 30 milliliters in u.s. The most commonly used ounces are the international avoirdupois and the troy ounces.

Troy ounce is used for the measurement of precious metals, gold, silver. The abbreviation is "oz".

Problem #1 - Convert 25.0 grams of KMnO4 to moles. Step One: The problem will tell you how many grams are present. Look for the unit of grams.

The number immediately preceeding it will be how many grams. Common abbreviations for grams include g (just the letter) and gm. I suppose that a problem can be worded in such a way that the number of grams comes after the unit, but that type of trickery isn't very common in high school.

The problem gives us 25.0 grams. Step Two: You need to know the molar mass of the substance. Please refer to the lessons about calculating the molecular weight and molar mass of a substance if you are not sure how to calculate a molar mass.

The molar mass of KMnO4 is 158.034 grams/mole. Please take a moment and calculate the molar mass of KMnO4, just to be sure. The answer of 0.158 mole has been rounded to three significant figures because the 25.0 value had the least number of significant figures in the problem.