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3 years ago

5

A sample of nitrogen in a glass bulb has a mass of 245 mg. What is this mass in kilograms? Give your answer to the correct numbe

r of significant figures.

2 answers:

OverLord2011 [107]3 years ago

8 0

Answer:

the answer is 0.000245kg

Explanation:

hope it helps

LekaFEV [45]3 years ago

3 0

1 mg = 10⁻⁶ kg

245 mg = 245·10⁻⁶ kg = 2.45·10⁻⁴ kg

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Consider the reaction 2 al + Fe2O3 to 2Fe + Al2O3. If 60.0g of Al is reacted with excess Fe2O3, determine the amount (in moles)

olganol [36]

The amount of Al2O3 in moles= 1.11 moles while in grams = 113.22 grams

<em><u>calculation</u></em>

2 Al + Fe2O3 → 2Fe + Al2O3

step 1: find the moles of Al by use of <u><em>moles= mass/molar mass </em></u>formula

= 60.0/27= 2.22 moles

Step 2: use the mole ratio to determine the moles of Al2O3.

The mole ratio of Al : Al2O3 is 2: 1 therefore the moles of Al2O3= 2.22/2=1.11 moles

Step 3: finds the mass of Al2O3 by us of <u><em>mass= moles x molar mass</em></u><em> </em>formula.

The molar mass of Al2O3 = (2x27) +( 16 x3) = 102 g/mol

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mario62 [17]

An organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.

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How many moles of h+ are associated with the acid h2so3 during neutralization?

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The picture above illustrate convergent, divergent and transform boundary.

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3 years ago