You can't, at least not like that. 0.4 grams is an amountwhile percent is a fraction of a whole.
To make 0.45 grams into percent you have to have something to compare it to, like 0.45 grams out of 0.90 grams is 50%.
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To convert 0.45 grams to a percentage, you would need to know the total mass or volume of the substance in which the 0.45 grams is a part of. Once you have the total mass or volume, you can divide 0.45 grams by the total mass or volume and then multiply by 100 to get the percentage.
To convert 1 kg of acetone to liters, you need to know the density of acetone. The density of acetone is around 0.791 kg per liter at room temperature, so 1 kg of acetone would be approximately 1.27 liters.
0.005 kg is equal to 5 grams. To convert kilograms to grams, you multiply by 1000 because there are 1000 grams in 1 kilogram.
1000 gms = 1 kg therefore four 500 gms= 2 kg(kilograms)
454 gms. per lb. 16 oz. per lb. 454/16= 28.375 gms. per oz. 65/28.375= 2.29 65 gms. = 2.29 oz.
A 1% solution normally contains 1 gram of active ingredient per 100 ml of solution (weight-volume percent) Could also be 1gm per 100 gms (weight-weight percent)- but normally weight-volume is used.