chemistry
You need to know the delta H for the reaction. That isn't listed in the problem but you can look it up. How much heat do you need? That's q = mass H2O x specific heat H2O x (Tfinal-Tintial) You have the data to calculate q needed. Then 24.3 g Mg x (q in kJ/delta H iin ...
chemistry
mols KBr soln 1 = M x L = ? mols KBr soln 2 = M x L = ? final M = total mols KBr/volume in L.
chemistry
See your post above.
chemistry
2C2H2 + 5O2 ==> 4CO2 + 2H2O b. mols C2H2 = grams/molar mass mols O2 = grams/molar mass Using the coefficients in the balanced equation, convert mols C2H2 to mols CO2. Do the same for mols O2. It is likely that the two values for mols CO2 will not be the same which means one...
Chemistry
Oxidation is the loss of electrons. Did it lose electrons? Looks like it gained electrons to me.
Chemistry
See your post above.
chemistry
mL1 x M1 = mL2 x M2 Substitute and solve for the unknown. mL*0.1M = 5 mL x 0.1M mL = ?
Chemistry
Technically this is a VERY tough probem and can't be answered with the information given. However, I assume that the person making up the problem meant that 0.1 mol HCl was added to enough water to make 1L of solution. (H^+) = (HCl) since HCl is 100% ionized. (H^+) = 0.1 m...
chemistry
In what? Reaction? procedure?
Chemistry
% by mass = (mass solute/g soln)*100 let x = mass solute [(x)/(400+x)]*100 = 5 Solve for x.
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