Other Chemistry Answers

7. What mass of copper(II) sulfate would remain
after removing all the water from 57 g of
CuSO4 · 5 H2O?
Answer in units of g.
12. A chemist wants to extract the gold from 49.06 g of AuCl3 · 2 H2O (gold(III) chloride
dihydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained
from this sample?
Answer in units of g.

Which of the following is not a reason why some substances whose purity cannot be exactly known?
A.because they are non-volatile.
B. they are highly hygroscopic
C. they react with CO2 in air or moisture in air
D.they react moisture in air

How much energy is required to raise the temperature of 18.6 g of water from 15°C to 134°C?

A 2L closed vessel contain 0.1mol nitrogen and 0.3 mol hydrogen, the gas reacted to form ammonia gas. 10min later, the vessel contain 0.22mol hydrogen gas. What is the average rate of hydrogen consume in molL-1min-1.

Consider the reaction 3CaCl2(aq) + 2Na3PO4(aq) --> Ca3(PO4)2(s) + 6 NaCl(aq) (molar mass of calcium phosphate is 310.18 g/mol)

What mass of Ca3(PO4)2 is produced from 94.2 mL of 0.250 M Na3PO4 solution and 275 mL of 0.150 M

For the reaction 2H2 + O2 2H2O, what is the total mass in grams of water formed when 8.00 grams of hydrogen reacts completely with excess oxygen?2

For the reaction 2NaOH + H2SO4--> Na2SO4 + 2H2O, how many moles of Na2SO4 will be produced from 3.50 moles of NaOH if excess H2SO4 is available?

You have 75 mL of a solution with [Zn2+] = 0.031 M. The pH of this solution = 8. You titrate this solution with 0.055M EDTA. Remember that pMn+ = -log(Mn+)
a) What is true at the equivalence volume for any titration?
b) Calculate the Ve (the equivalence volume) for this titration?
c) Calculate the pZn2+ after addition of 20 mL EDTA
d) Calculate the pZn2+ at the equivalence volume
e) Calculate the pZn2+ after addition of 50 mL EDTA

How many grams of KCIO3 are needed to make 1.5 x 10^24 particles of O2

2KCI + 3O2 = 2KCIO3

Please predict the bond angles about the central atom in: Words to choose:bent,trigonometry planar,tetrahedral,trigonal bipyramidal,octahedral,0 non bonding pairs,1 non bonding pairs,2 non bonding pairs,109,5 degrees,120 degrees,180 degrees.Thanks.
. 4)CBr4:____Electron-domain geometry with_____on C.We confidently predict _____angles. 5)TeBr4:_____electron-domain geometry with_____on Te will cause the bond angles to deviate from ideal values.