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1. When 14.25 g of magnesium was heated in air, 23.61 gof magnesium oxide was produced.
a) What mass of oxygen has combined with the magnesium?
b) What percent of the magnesium oxide is magnesium?
2. When aluminum combines with chlorine gas, theyproduce the substance aluminum choride. If 4.94 g of aluminumchloride is formed from 1.00 g of aluminum, how many grams ofchlorine will combine with 6.25 g of aluminum?
A first order reaction has a half-life of 1.34 x 10^-3 hours. If the initial concentration of the reactant is 8.00M, what is its concentration after 4 half-lives?
Aluminum has a specific heat of 0.880 J/g-deg. How many joules are needed to heat 155g of Al from 20.0oC to 75.0oC
a compound has the empirical formula ch2o. when 0.0866g is dissolved in 1.000g of ether the solutions boiling point is
a balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026mol H2 at 739 mmHg. what is the partial pressure of O2?
2Na(s) + Cl2(g) ? 2NaCl(s) If 5.00 g of sodium metal reacts completely with excess chlorine gas, and 11.5 g NaCl is actually obtained, what is the percent yield of sodium chloride
Describe 4 experimental factor that can influence the retention time of analytes in GLC. Discuss how changing each experimental factor will affect retention time and why.
A solution is made by dissolving 3.14g of NaCl in 79.9mL of water. What is the concentration of sodium chloride in units of weight/volume percent?
Calculate the of 0.280L of a 0.450M NaHSO3 - 0.285M Na2SO3 buffer before and after the addition of the following substances.
When a 0.325 g sample was studied by combustion analysis, 0.583 g of CO2 and 0.0790 g of H2O formed. How many moles of each of the following were in the original sample and what is the molecular formula
Draw the Lewis dot structure of ethanol. Estimate the bond angles and the hybrid orbitals found for each carbon and for the oxygen.
If you mix 10.0 grams of CH3SH with excess CO and 8.65 grams of CH3COSCH3 is produced, what is the percent yield of the CH3COSCH3?
55.0 mL of a 1.70 M solution is diluted to a volume of 278 mL. A 139 mL portion of that solution is diluted using 175 mL of water. What is the final concentration.
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