4.2. What mass of magnesium hypobromite will contain the same number of oxygen atoms as 12.34 mg of aluminium chlorate? (Note: bromate = Br03¯)
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- Chlorine exists mainly as two isotopes, 37Cl and 33Cl. Which is more abundant? How do you know?Name: 1. Which sample contains a total of 9.0 × 1023 atoms? (1) 0.50 mole of HCI (3) 1.5 moles of Cu (2) 0.75 mole of H₂O (4) 1.5 moles of H₂ 2. What is the total number of nitrogen atoms in 0.25 mole of NO2 gas? (1) 1.5 x 1023 (2) 6.0 x 1023 (3) 3.0 x 1023 (4) 1.2 x 1024 3. What is the total number of neon atoms contained in 20.2 grams of neon gas? (1) 1.01 x 1024 (2) 2.02 x 1024 (3) 3.01 x 1023 (4) 6.02 x 1023 Practice 4. Which sample contains a total of 6.0 x 1023 atoms? (1) 23 g Na (2) 24 g C (3) 42 g Kr (4) 78 g K 5. The number of atoms in 10. grams of calcium is equal to 6.0 x 1023 multiplied by (1) 0.25 (3) 10. (4) 40. (2) 0.50 6. How many molecules are contained in 127 grams of iodine (1₂)? (1) 1.50 x 1023 (2) 3.01 x 1023 (3) 9.03 x 1023 (4) 12.4 x 1023 7. What is the total number of molecules of SO₂ in a 0.10-mole sample of SO₂? (1) 6.0 × 1021 (2) 6.0 × 1022 (3) 6.0 x 1023 (4) 6.0 x 1024 Quantities of Matter 8. What is the total volume occupied by 132 grams of CO₂(g) at STP?…t: Find the number of Na" ions in 2.92 g of NasPO 2: Find the number of K ions in 3.41 mol of K;HPO? 3: Find the amount of the indicated element (in moles) in: ing (a) 8.75 g of B.O,. NO were (b) 167.2 mg of Na;B.Qr. 10H,0. (c) 4.96 g of Mn,O. faden: M (d) 333 mg of CaC.O. limoles 4: Find the amount in millimoles of the indicated species in: ple (a) 850 mg of PO. (b) 40 g of CO,. dution (c) 12.92 g of NaHCO (d) 57 mg of MgNH,PO, 5: a- Determine the mass in grams of 2.6 mol of backing Soda, NaHCn b-How many moles of penicillin CioHO,N;S are there in 218 g ntion of solutions
- Help me please(3.8: Similar to For More Practice 3.13) Determine the mass of a sample of carbon monoxide containing 3.55 x 1022 carbon monoxide molecules. O 9.94 g O 0.581 g O 0.763 g O 1.65 g(2) Based on the thermite reaction, Fe2O3 (s) + 2 Al (s) --- Fe (I) + Al203 (s), (2.A. on question 12) How much aluminum oxide (Al2O3) is formed from 21.5 gram of ferric oxide (Fe2O3)? (2.B. on question 13) How much aluminum oxide (Al2O3) is formed from 8.0 gram of aluminum (Al)? (2.C. on question 14) What is the limiting reagent? Molar Masses 1 mole of Fez2O3 = 159.69 grams of Fe2O3 1 mole of Al = 26.98 grams of Al %3D 1 mole of Al2O3 = 101.96 grams of Al2O3 Ratio: 1 mole of Fez2O3 = 1 mole of Al2O3 2 mole of Al = 1 mole of Al2O3
- 5. ) 221.89 g/mol 38.00 g/mol 253.8 g/mol 2IF5(s) a 5 F2(g) + I2(s) a. What is the mass (in grams) of fluorine gas that can be produced from 85.00 grams of iodine pentafluoride? b. Calculate the percent yield if a student uses 85.00 grams of iodine pentafluoride, but obtains 23.20 grams of fluorine gas.1. Find the necessary amount of Ag,CO; in grams in order to obtain 79.1 g of silver. A92CO3 · Ag(s) + CO2 + 02 (unbalanced) C: 12 g/mol, O: 16 g/mol, Ag: 107.9 g/mol4 nm 10. Give the empirical formula for vitamin C (ascorbic acid), C,H;O6
- 5) 6.61 grams of octane, a molecule composed of oxygen and hydrogen that is found in gasoline, is analyzed by combustion. The reaction produces 20.39 grams of CO2 and 9.38 grams of H2O. a. What is the empirical formula of octane? Show calculations to support your answers. b. The molecular weight of octane is found in another experiment to be 114.2 g/mol, what is the molecular formula of octane?Write The Molecular Fotmula For The Following 1-Copper Sulfate 2-Phospours Pentabromide 3-Calicum Chloride dihydrate * 4-Sodium Oxide A- Balance The Equation NO2(g) + H2O(1) -- HNO3(1) + NO(g) B- What is formula mass of K2Cr207 (O=16g/mol , Cr=52g/mol and K=39g/mol) C- Calculate the empirical ----- formula of a C6H1206 that following present composition by mass: C=23.75%, H=37.5% and O=40% percent. (C-12g/mol, * H=1g/mol and O=16g/mol) What is mean the Base according to -1 Arrhenius and the Acid acoording to Bronsted ? 2- What the solvent of 100ml N2 and 25ml 02 ? Why? 3-What is Oxidation Number of ions in these compouds a- * KMNO4 b-MgH2 c-H2O2 d-N2 e-CIO3 -15. A 1.547 g sample of CuSO4 xH20 is heated to drive off the water leaving behind 0.989 g of anhydrous CuSO4. What is the value of x for this hydrate? 1.547