Marc Pomi 106040098 Extra Credit Questions 1) What is a possible suggestion for why Mercury has such a high density? A) An asteroid collided with Mercury to destroy the outer crust and leave mostly metal composition. B) Mercury was originally created with
I Empirical Formulas 1. A compound that contains only carbon, hydrogen, and oxygen is 48.64% C, and 8.16% H. Determine its empirical formula. (Note: % O should be found)
The combustion of a compound CxHy formed 3.08g CO2 and 2.52 g H2O. Calculate its e
Empirical & Molecular Formulas.
1. Calculate the empirical formula of CxHyOz from these results: The combustion of 1.39 g of this compound formed 3.16 g CO2 and 1.29 g H2O
Find the molecular formula if the mm = 174 2. The combustion of 5.23 g of anothe
Empirical formula from %composition
Empirical formulas show the LOWEST WHOLE NUMBER ratios of atoms.
1.Given the % comp. of compound CxHyNz , determine its empirical formula. % C = 74.0 % H = 8.70 % N = 17.3 2. Given the % comp. of compound CrxOy , determ
Molecular mass (mm) & MOLAR Mass (MM)
Different units, SAME # #amu/molecule
18.0 amu x 1 gram molecule 6.022 x 1023amu
x 6.022 x 1023molecules = 18.0 gram 1 MOL MOL
1. For Na3PO4
Mass of 0.45 mol Na3PO4
2. For Ca(ClO3)2
SOME review questions for the Final Exam (A07)
1. A 3.00 g sample of an alloy (containing only Pb and Sn) was dissolved in nitric acid . Sulfuric acid was added to this solution, which precipitated 2.73 g of PbSO4 (mm: 303.3). Assuming that all of the lea
Stoichiometry Problems I. Al + NH4ClO4 Al2O3 + AlCl3 + NO + H2O
a. Balance the equation.
Calculate the #mol NH4ClO4 needed to react with 1.00 kg of Al.
c. Calculate the # mol and the mass Al2O3 formed.
C3H8 + NH3 + 2 O2
C3H3N + 4 H2O
Stoichiometry H.W. I. Given the reaction Sr3P2 + 4 O2 3 SrO + P2O5 We use 411 g Sr3P2 and 51.1 g O2 a. Calculate mass P2O5 formed (which is limiting?)
b. Final mass Sr3P2 :
c. Final mass O2:
d. Final mass SrO:
CH1010 General Chemistry I
Professor Sonia GLAZER Office GH104 Phone 5405 Web: http:/my.wpi.edu Office hours: Appointments made by e-mail ([email protected])
Classes meet four times a week M,T,R,F 11:00-11:50 in SL115 There w
Douglasite is the mineral is 2KCl.FeCl2.2H2O. 0.4550 g of rock containing douglasite is treated by AgNO3. It took 37.20 ml of 0.1000 M AgNO3 to precipitate all Cl- as AgCl. Calculate the % by mass of the mineral in the sample.
% purity . A 54.0 g sample contains NaCl. When dissolved, the solution reacts with Ag+ to form 62.4 g of AgCl. Calculate the % purity of the original sample.
A 168.0 g sample contains Pb(NO3)2 When dissolved, the solution reacts with I- to form 182.2 g of