Chapter 2, Problem 2.29E

The mass spectrum of CH3Cl is illustrated here. You know that carbon has two stable isotopes, and 13C with relative abundances of 98.9% and 1.1%, respectively, and chlorine has two isotopes, 35a and 37CI with abundances of 75.77% and 24.23%, respectively. (a) What molecular species gives rise to the lines at m/Z of 50 and 52? Why is the line at 52 about 1/3 the height of the line at 50? (b) What species might be responsible for the line at m/Z = 51?

An element X bas five major isotopes, which are listed below along with their abundances. What is the element? Isotope Percent Natural Abundance Mass (u) 46x 8.00% 45.95232 47x 7.30% 46.951764 48x 73.80% 47.947947 49x 5.50% 48.947841 50x 5.40% 49.944792

You find a compound composed only of element X and chlorine. and you know that the compound is 13.10% X by mass. Each molecule of the compound contains six times as many chlorine atoms as X atoms. What is element X?

The weight percent of oxygen in an oxide that has the formula MO2 is 15.2%. What is the molar mass of this compound? What element or elements are possible for M?

An element, X. forms a compound with Carbon for which the formula is XC₂. If 37.48% of the compound is carbon. what is the atomic weight of X?

Find the molar mass for each of the following compounds: a. CsI c. C12H22011 e.HCH3O2 b. CaHPOA d. I f. Mg3 (PO4)2

3 A2B + 6 CD --> 6 AD + 3 C2B (OR 3 A2 B + 6 C D right arrow 6 A D + 3 C2 B) Calculate the number of molecules of AD formed from the reaction of (6.300x10^1) grams of A2B and (1.93100x10^3) grams of CD The atomic weight of A is 15.0 grams/mol The atomic weight of B is 50.0 grams/mol The atomic weight of C is 35.0 grams/mol The atomic weight of D is 120.0 grams/mol Avogadro's number is (6.02200x10^23)

Manganese sulfate forms the hydrate MnSO4⋅?H2O(s)MnSO4⋅nH2O(s) . If this hydrate is heated to a high enough temperature, H2O(g)H2O(g) can be driven off, leaving MnSO4(s)MnSO4(s) . A 10.140 g10.140 g sample of the hydrate was heated to 300 ∘C300 ∘C . The resulting MnSO4(s)MnSO4(s) had a mass of 9.0592 g9.0592 g. Calculate the value of ?n in MnSO4⋅?H2O(s)MnSO4⋅nH2O(s) .

Caffeine (MW 194.2 g/mol) is a stimulant found in coffee, tea, many soft drinks, and chocolate. Elemental analysis of caffeine shows 49.47 mass % C, 5.19% H, 28.86% N, and 16.48% O. What is the molecular formula of caffeine?   Use the following amu: C = 12 g/mol; H = 1 g/mol; N = 14 g/mol; O = 16 g/mol (Please type answer no write by hend)