CHEM 1110 Midterm: Chemistry 1110 2003 Fall Test 1
Document Summary
Instructions: you have 75 minutes to complete this 100-point exam. Indicate your exam form on the line marked subject on the scantron. 24: fe, ge, ba, cr, an atom of strontium 90 ( 100: how many moles of potassium ions are in 25. 0 g of k2so4? (mm of k2so4 = 174. 26 g/mol, 0. 286 mol k, 0. 286 mol k, 0. 143 mol k, 0. 143 mol k. Calculations (30 pts, 10 pts each): clearly indicate your answer in the space provided. Partial credit will be given for correct work. If i cannot read the work, it will not be graded: a compound is found to consist of 34. 9% sodium, 16. 4% boron and 48. 6% oxygen. What is its empirical formula? (mm of na = 22. 99 g/mol, mm of b = 10. 81 g/mol and mm of o = 16. 00 g/mol: an element, q from planet quark has a molar mass of 326. 950 g/mol. This element has two isotopes, 320q (320. 019 g/mol) and 328q (327. 995 g/mol).
