جامعة فلسطين التقنية - الخليل Assignment 1 (كيمياء للمهن الصحية)

‫( الكيمياء للمهن الصحية‬22015) First semester 2024 / 2025 Student name Assignment # 1 (5 points) Dr. Nader Yaghi Deadline Sunday 13 October, 2024 1. If you have an element 75 33...

‫( الكيمياء للمهن الصحية‬22015) First semester 2024 / 2025 Student name Assignment # 1 (5 points) Dr. Nader Yaghi Deadline Sunday 13 October, 2024 1. If you have an element 75 33𝐸 ; Answer the following questions a. How many electrons are in the atom b. How many Protons are in the atom c. How many Neutrons are in the atom d. Write the electron configuration e. What is the charge of its ion f. For which group this element is belong g. For which period this element is belong 2. Perform the following conversions: a. 3.23 m to nm b. 45 K to F (Fahrenheit scal) c. 143 ml to L 3. How many significant figures are there in the following measured quantities? a. 100.1 °C ………………. a. 1.2*10-5 g ………………. b. 0.00309 cm ………………. 4. Perform the following arithmetic and express the answers with the correct units. a. 3.128+5.127-6.72 b. 0.000258 * 1025.25 / 12.0221 c. (3.216 *102) * (3.66 *10-4) / (3.0 *10-3) 5. How many moles of S are in 1.00 mol of As2S3 6. Calculate the percentage composition of the following a. N in 12.6 g NH4NO3 b. O in C2H4O2 7. Butane, the volatile liquid fuel in disposable cigarette lighters, has the formula C4H10. a. What is the mole ratio of C to H in this compound b. How many moles of C are in 3.00 mol C4H10 c. How many moles of H are in 0.250 mol C4H10 d. How many atoms of H in 0.250 g C4H10 e. how many atoms are in 0.125 g C4H10 f. How many moles of C must combine with 0.600 mol H to make this compound 8. A 1.350g sample of a substance containing carbon, hydrogen, nitrogen, and oxygen was burned to produce 0.810 g H2O and 1.32 g CO2. In a separate reaction, all the nitrogen in 0.735 g of the substance was converted to ammonia. This gave 0.284 g NH3. Determine the empirical formula of the substance.