Chemistry conversion/derivation problems?

L

Lire~Sama

New member
I need slightly detailed instructions on how to solve this, applying the rules of scientific notation and significant figures.

A substance was found to have 9.50 Zg of bacteria. If 4.5908 Mg was extracted from it, how many grams were left in the substance?

Derive the formula fr the density of a solvent using the molarity formula. Molar = mass of solute/volume of solution.

The density of a gas is 0.945 g/L. Compute for its mass, given it is a 0.85 mol gas at 295K with 0.6 atm pressure. (Use the ideal gas law, PV=nRT)

This will greatly help my classmates and I. Thank you so much!
 
hey
pv = nrt where symbols have their usual meaning n
now v=m/density(d)
so we have by putting it in the ideal equation pm=drt where m is the mass of the gas (not molecular)
or pm = n drt if n is not 1
now ur ques.
0.6 * m= 0.945 * r * 295
i hope u can find ur answer from it
 
Curious?

What's Zg? And Mg? Surely you don't mean mega-grams? But that is what a capital "m" means. Maybe you mean miligrams? That is mg.

And surely you known by now that density = mass / volume and that the molar mass is the mass of one mole.

If you know that PV = nRT then you know that you can solve for the volume, and if you know the volume and the density you can easily solve for mass.
 
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