A compound Z is known to have a composition of 34.38% Ni, 28.13% C, and 37.48% O. In an experiment 1.00 L of gaseous Z is mixed with 1.00 L of argon, where each gas is at P 5 2.00 atm and T 5 258C. When this mixture of gases is put in an effusion chamber, the ratio of Z molecules to Ar molecules in the effused mixture is 0.4837. Using these data, calculate the following. a. the empirical formula for Z b. the molar mass for Z c. the molecular formula for Z d. the mole ratio of Z to argon in a sample of gas obtained by five effusion steps (starting with the original mixture)
Chemistry 1010 8/30/2017-9/1/2017 “Are all rocks the same” Granite -Heterogeneous: we can see boundaries. Mixtures. Can separate -granite is composed of different rocks that have been crushed together Chert -Homogeneous: we don’t see boundaries -property: if striked just right it will fall into flakes Distinguish Properties into 2 types 1. Physical -Changes that do not alter composition 2. Chemical -properties that a substance has that is involved in changing into another substance Techniques used for separating samples of matter Heterogeneous separated by -sorting, decanting, filtration Homogeneous separated by -distillation, crystallization (salt, sugar), chromatography Greek P
