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how to change from empirical formula to molecular formula?

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FIDA

n(62.9296amu) +(1-n)(64.8278)=63.546

u must find n first

then *100 to get percentage for Cu63

for Cu 65

=100%-percentage of Cu63

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why is the theoritical yeild of a reaction determined only by the amount of limiting reagent?

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madam how can we identify either the actual yeild and theoritical yeild in a question given?

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Any tips on balancing equation?

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how many formula that we have to remember on this topic?..

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Is it crucial we have to memorise formula polyatomic cation and anion

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how to find molality if given information is 4.59M ethanol solution? Density of ethanol (0.9441g/mL

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Really?Why?

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cant open it through ilearn

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Yes madam.Is it PI009P2?

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The concentrated sulfuric acid we use in the laboratory is 98% H2SO4 by mass. calculate the molality and molarity of the acid solution. what is mean by 98% H2SO4 by mass?

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Can anyoune explain what is about subatomic particles

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Question : Copper has two naturally occuring isotopes. 63 Cu ( isotopic mass 62.9296 amu) and 65 Cu ( isotopic mass 64.8278 amu). If copper has an atomic mass of 63.546 amu, what is the percent abundance of each isotope?

Can anyone help me? i want to know the work calculation one by one for it.

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well,here's the formula molarity,M =amount of solute (moles) / amount of solution (L) molality,m = moles of solute / mass of solvent (kg)

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thanks hanis

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is dilution and titration the same?

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oh,i'm wrong. the mass of lead chromate is in kg. so, supposely the answer 281.5 g

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madam. when we were given a density of a solution, we just simply multiply it with 1000 to get it mass.

such as when we got 1.18g/ml.. we *1000 then get 1180g? right? or is it wrong ? >.<

i can find myself to understand it.. can u help me ? why not use 100 or even 10? why it must 1000?

and how about if we want to find the volume?

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molality=moles/kg

molarity=moles/volume

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answer for AR HUSIEN question

mol lead chromate = mole lead(II)sulphate which is 0.000928 mol

mass of lead(II)sulphate is 0.281g. am I right?

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Hafizuddin MOLARITY is moles of solute per 1 liter of solution while MOLALITY is moles of solute per 1 kg of solvent.

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anyone please help me to explain of this formula molality,m=moles of solute/kg of solvent...i really do not understand about it...thank you

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how can we get the previous quiz questions? (mcgraw hill because many things i wanna ask from that questions

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madam,what is the function of concentrations expressions?

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if im not mistake naim. first we need to find the theoritical yield and then use the formula

actual yield/theoritical yield *100%= percent yield from this formula we can find the actual yield

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what about actual yield, cause there are question ask to find it?

is it we should find teoritical yeild or what?

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theoretical yield is amount you obtain based on the equation

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difference btw molarity and molality?

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the theoritical yield is what u can calculate from no of mole of reactant,

actual yield is what u got from experiment

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madam can u explain to me about subtopic about additional electron in the same orbital/energy sublevel? im not understand about this..

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Yes u can

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madam can I ask question from chapter 2?

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how to identify the teoritical yield

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NH3HCO3?

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first equation is for neutralization.

second equation is for dilution.

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whats the different between MaVa/MbVb=a/b and m1v1=m2v2?

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Your question is too general, more specific?

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How do u calculate it?

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the eqn seems balanced

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Molecular compounds or covalent compounds are those in which the elements share electrons via covalent bonds. The only type of molecular compound a chemistry student is expected to be able to name is a binary covalent compound. This is a covalent compound made up of only two different elements.

Identifying Molecular Compounds

Molecular compounds contain two or more nonmetals (not the ammonium ion). Usually, you can recognize a molecular compound because the first element in the compound name is a nonmetal.

Some molecular compounds contain hydrogen, however, if you see a compound which starts with "H", you can assume it is an acid and not a molecular compound. Compounds consisting only of carbon with hydrogen are called hydrocarbons. Hydrocarbons have their own special nomenclature, so they are treated differently from other molecular compounds.

Writing Formulas for Covalent Compounds

Certain rules apply to the way names of covalent compounds are written:

The more electropositive element (further left on the periodic table) is listed before the more electronegative element (further right on the periodic table).

The second element is given an -ide ending.

Prefixes are used to denote how many atoms of each element are present in the compound.

Prefixes and Molecular Compound Names

Nonmetals may combine in a variety of ratios, so it is important that the name of a molecular compound indicates how many atoms of each type of element are present in the compound.

This is accomplished using prefixes. If there is only one atom of the first element, no prefix is used. It is customary to prefix the name of one atom of the second element with mono-. For example, CO is named carbon monoxide rather than carbon oxide.

Examples of Covalent Compound Names

SO ₂ - sulfur dioxide
SF ₆ - sulfur hexafluoride
CCl ₄ - carbon tetrachloride
NI ₃ - nitrogen triiodide

Writing the Formula from the Name

You can write the formula for a covalent compound from its name by writing the symbols for the first and second element and translating the prefixes into subscripts. For example, xenon hexafluoride would be written XF ₆. It is common for students to have trouble writing formulae from compounds names as ionic compounds and covalent compounds are often confused. You aren't balancing charges of covalent compounds; if the compound does not contain a metal, don't try to balance this!
Molecular Compound Prefixes

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How to Name Molecular or Covalent Compounds

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Molecular compounds or covalent compounds are those in which the elements share electrons via covalent bonds. The only type of molecular compound a chemistry student is expected to be able to name is a binary covalent compound. This is a covalent compound made up of only two different elements.

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PbSO4 + Na2CrO4 --> PbCrO4 + Na2SO4 is the equation right?

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How to naming molecucar compound?

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Owh..so the answer is 281.5 grams of lead(II) sulfate..

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that formula for dilution

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m1v1=m2v2?

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How to calculate fractional abundance of isotopes when the atomic mass and isotopic mass is given?

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How many grams of lead(II) sulfate will be needed to react with sodium chromate to produce 0.3 kg of lead(II) chromate? Sodium sulfate is also produced.PLEASE HELP ME

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Salam,

Feel free to ask anything that u don't understand on Chapter 1

*make sure u write your name before u post anything =)