139 Answered Questions for the topic Moles

Moles Chemistry

03/04/16

A 0.25mol sample of a certain substance has a mass of 10g, what is the molar mass of this substance? Which element has the same molar mass?
A 0.25mol sample of a certain substance has a mass of 10g, what is the molar mass of this substance? Which element has the same molar mass?
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01/25/16

Stoichiometry
Calculate the amount of lime that can be produced by heating 100g of 90% pure Limestone
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12/20/15

how many grams of sugar would you need to have the same number of particles as 5.0 grams of salt?
I'm having a hard time with my chemistry lab, please help!
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10/06/15

According to the following reaction, how many moles of hydrogen gas will be formed upon the complete reaction of 0.235 moles hydrobromic acid? hydrobromic acid
According to the following reaction, how many moles of hydrogen gas will be formed upon the complete reaction of 0.235 moles hydrobromic acid?hydrobromic acid (aq) hydrogen (g) + bromine (l)
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09/23/15

The molar mass of aspirin is 180.16 g/mol. What is the theoretical yield in grams, for the aspirin she theoretically obtained above using 4.02 g of SA?
The molar mass of aspirin is 180.16 g/mol. What is the theoretical yield in grams, for the aspirin she theoretically obtained above using 4.02 g of SA? What is the percent yield?
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09/23/15

The molar mass of salicylic acid (SA) is 138.12 g/mol. How many theoretical mols are there in the 4.02 g of the SA reactant the student started the reaction wit
The molar mass of salicylic acid (SA) is 138.12 g/mol. How many theoretical mols are there in the 4.02 g of the SA reactant the student started the reaction with?
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05/17/15

How many miles of P4 are needed to produce 10.5L at STP
The balanced equation is  8P4 + 3S8 ---> 8P4S3
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04/25/15

Finding concentration!
Please help if you're able. I really don't understand this at all.    A student has a flask containing nitric acid (HNO3 (aq)). She is not sure what the concentration of this acidic solution is... more
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04/21/15

Gas Laws and stoichiometry
Assume that 18.4 g of Al react with HCl according to the equation Al(s) + HCl(aq) −→ AlCl3(aq) + H2(g) at STP. How many moles of Al react? Remember to balance the equation first. Answer in units of... more
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Moles Chemistry

04/14/15

How many moles of silver chloride are required to make a 1.0M solution of silver chloride in a 100mL volumetric flask?
I have no clue what I am doing please help me 
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04/14/15

Chemistry Equation! Help is much appreciated!
Please answer these equations and show how you got the answer! Thanks! 1. (209.6J/K) = [2mol(213.74 J/molK) + 6mol(S (188.825 J/molK)] – [1mol(219.56 J/molK) + 3mol(x)] 2. ?Grxn = [12mol(-394.359... more
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Moles

02/04/14

change from grams to mole units
8.96 of Ca3(PO4)2 Change from grams to mole units
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Moles

02/04/14

change from grams to mole units
10.65g of BaBr2
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Moles Chemistry

12/04/12

calculate the molecular weight of CO in g/mol.
what is the asnwer?
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