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This question cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.

It takes only a little mental effort to compare a mg of air and a mg of lead to see that the two will have very different volumes.

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Q: 0.42 milligrams is equal to how many milliliters?
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What is the mass of 4.9810e21 platinum atoms?

The mass of 4.9810e21 platinum atoms is 0,000 042 g.


Is there 48 karat gold?

For the benefit of those who do not know what a karat is, the karat (a.k.a. carat) is a measure of the purity of gold alloys. There is no such thing as 48 carat gold simply because carat is a percentage, with 24 being pretty much 100 % purity (you cannot have 200% pure gold, it makes no sense). The most common carats used for gold in bullion, jewelery making and by goldsmiths are:* 24 carat (millesimal fineness 999) * 22 carat (millesimal fineness 916) * 20 carat (millesimal fineness 833) * 18 carat (millesimal fineness 750) * 15 carat (millesimal fineness 625) * 14 carat (millesimal fineness 585) * 10 carat (millesimal fineness 417) * 9 carat (millesimal fineness 375) * 8 carat (millesimal fineness 333) * 1 carat (millesimal fineness 042) Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal by mass in the alloy. For example, an alloy containing 75% gold is denoted as "750".


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