Need help with 2 AP chem questions.
Q1: A piece of magnesium was added to excess HCL at 725 mm Hg and 28.0°C. If 38.0 mL of hydrogen was collected over 20.0°C water, what is the mass of the magnesium?Q2: In the reaction Mg(s) +...
Ap Chem question
How many kilojoules of heat are absorbed when 1.25 mol is converted from liquid at 15.0℃ at vapor at 25.0℃? The specific heat of (l) is 4.18 J/g℃. The heat of vaporization of water is 44.0...
For the following structure, predict the hybridization about the central atom. Use superscripts as needed.X---Y---X*Y has 6 lone pairs
Arrange the following species in order of decreasing first ionization energy:ArCaXeNe
When 3.02 g of NH4Cl is dissolved in enough water to make 20.05 mL of solution, the temperature dropped from 19.8°C to 9.1°C. Calculate the enthalpy change (in kJ) when 1 mole of NH4Cl is...
Calculate ΔH° for the following reactionZn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
True or falseIf I have excess magnesium ribbon at the end of the reaction, I don't need to do a titration because I can assume that HCl was completely consumed.
coffee cup calorimetry
1) In this virtual lab, you will use coffee cup calorimetry to determine the specific heat, c, of a metal. Imagine that, in lab, you record the mass of a piece of metal, mmetal, as m(metal) =45.00...
Given these reactions,X(s) +1/2 O2(g) --> XO(s)ΔH=-539.5 kJXCO3(s) --> XO(s)+CO2(g)ΔH=+266.3 kJwhat is ΔHrxn for this reaction?X(s)+1/2 O2(g)+CO2(g) --> XCO3(s)
A gas mixture is made by combining 7.2g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 17.07L. What is the molar mass of the unknown gas in g/mol, and...
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. What volume of H2(g) is produced when 6.50 g of Al(s) reacts at STP?
Molarity Written Response
Angelica made 100mL of a 3.5M salt solution. She wanted to dilute this solution to make 100mL of a 2.1M solution. She calculated that she needed 60mL of her stock solution. She added the 60mL to...
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.
CaCO3 + 2HCl = CaCl2 (aq) + H2O + CO2 A.)How many grams of calcium chloride will be...
Unknown compound combustion
An unknown compound contains only C, H, and O. Combustion of 6.10 g of this compound produced 14.4 g of CO₂ and 3.92 g of H₂O. What is the empirical formula of the unknown compound?
What is the density of the solid object?
A certain liquid has a density of 0.79355 g/mL. A solid object with a mass of 43.51 grams is placed in a sample of the liquid (the solid is insoluble in the liquid). The total volume of the solid...
how Many grams of element z
137.34 grams of element X reacts with 67.41 grams of element Z to form a compound. How many grams of the same compound could be produced using 55.1 grams of element X with excess element Z?
What is the average atomic mass of this element
Problems SetB » SummerB_08A newly discovered element is found to have four isotopes. The first isotope has a mass of 628.7 amu and a percent abundance of 24.21 %. The second isotope has a mass of...
What is Percent Yeild of reaction
0.428 liters of hydrogen gas was reacted with excess fluorine gas to produce hydrogen fluoride. Given that the density of the hydrogen gas is 0.082 g/L, what was the percent yield of the reaction...