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Eddi Din [679]
2 years ago
10

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxid

e were formed (number of moles = mass (g) / molar mass (g/mol))? choose the closest answer.
a.0.21 moles

b.0.41 moles

c.0.11 moles

d.0.31 moles submit for grading save and finish later
Chemistry
1 answer:
gulaghasi [49]2 years ago
3 0
Number of moles = mass of product / molecular mass
=mass of product (MgO) / 40.3

Since the mass of MgO is not given in the question, the correct answer choice cannot be given.  However, proceeding witht eh above formula will enable you to find the correct number of moles given the mass of MgO.
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A

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Which of the following could be the subsh
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3 years ago
What is the pressure in millimeters of mercury of 0.0130 molmol of helium gas with a volume of 210. mLmL at 55 ∘C∘C? (Hint: You
juin [17]

Answer : The pressure of the helium gas is, 1269.2 mmHg

Explanation :

To calculate the pressure of the gas we are using ideal gas equation:

PV=nRT

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T = Temperature of He gas = 55^oC=273+55=328K

Putting values in above equation, we get:

P\times 0.210L=0.0130mole\times (0.0821L.atm/mol.K)\times 328K

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4 0
3 years ago
Help would be majorly appreciated
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Answer:

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Read 2 more answers
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