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marysya [2.9K]
2 years ago
10

1 mg is equal to 10-3 hg. 103 dg. 10-3 g. 10-2g.

Chemistry
2 answers:
tresset_1 [31]2 years ago
6 0
1 mg is equal to <span>10-3 gram.

1 gram is equal to 1000 milligrams

1 milligram (1 gram / 1000 milligram) = 1 x 10^-3 or 10^-3 gram</span>
9966 [12]2 years ago
6 0

The correct answer is C. 10^{-3}g

Explanation:

A milligram (mg) is a unit for measuring mass in the same way that grams or kilograms; however, the milligram is one of the smallest units of this kind. In terms of equivalence, the milligram can be equivalent to other mass units including the kilogram (kg), the hectogram (hg), the decigram (dg) and the gram (g). Indeed 1 mg is equivalent to 0,000001 kg or 10^{-6} kg; also it is equivalent to 0,00001 dg or 10^{-5}, to 0,001 g. or 10^{-3} g. or to 0,01 dg or 10^{-2}. Thus, the option that shows the correct equivalence of 1 mg is 10^{3} g because a milligram is equivalent to 0.001 grames.

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When the balanced equation for this reaction is:
2Fe + 3H2O → Fe2O3  +  3H2

and according to the vapour pressure formula:
PV= nRT
when we have P is the vapor pressure of H2O= 0.121 atm
and V is the volume of H2O = 4.5 L
and T in Kelvin = 52.5 +273 = 325.5 K
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So we can get n H2O
So, by substitution:
n H2O = PV/RT
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we can get the Mass of Fe2O3 from this formula:
Mass = number of moles * molecular weight       
  when we have a molecular weight of Fe2O3 = 159.7
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∴ 1.084 gm of Fe2O3 will produced
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