for a sample of 2.007 microLiters of C2H6S what is the number of moles if the...
a) Calculate the number of moles of iron in a 15.0 g sample of iron. b) Calculate the number of atoms in 0.25 mol of silicon. c) Calculate the mass in grams needed to have 2.65 x 1022 atoms of calcium.
d. What is the mole ratio (moles of Cu/moles of O) in the sample? What is the formula of the oxide? (The atom ratio equals the mole ratio and is expressed using the smallest integers possible.) e. f. What is the molar mass of the copper oxide? g/mol
A sample of N2O3 contains 2.26 moles of nitrogen. Use the following atomic masses: N =14, O=16. The number of moles of N2O3 present = mol N2O3 The mass of the sample = g N2O3 The number of moles of oxygen in the sample = mol O The mass of oxygen in the sample = g O
Calculate the number of moles of BaCl2 in a 4.5 g sample of BaCl2 Use moles = g/MW; 56Ba137; 17Cl35.5
What number of moles are in a gas sample with the following data? Volume -5.19 L Temperature - 37.0°C Pressure: 0.985 atm 0.153 mol 0.201 mol 23. 3 mol 128 mol
Complete the following table. atoms in sample molecules in sample moles of sample mass of sample 404.70e25 X 403.19e22 400530 mol 4.14 g C6H6 402.60e24X 40 1.44e23 0.239 mol H2O 404.31 9 2.61 2.61 x 1022 molecules CO2 404.3 mol 4.0 191 g 7.28 40 7.29e23 1.21 mol HCI 4A44.1 444.08 4.08 x 1024 molecules H20 40 6.78 mol 40122 405.71e21 5.71 Check the number of significant figures. mol a0 .0095 0.304 g CH30H
If there are 0.20 moles in 8.9 grams of CO2, what is the number of CO2 molecules? Use this equation to find the answer: Moles in sample (mol) x Avogadro's number (6.022 x 1023) = Number of sample molecules 0.20 x 1023 1.2 x 1023 8.9 x 1023 20 x 1023
What mass, in g, of vitamin C is present in a sample containing 0.00002979 moles of vitamin C? DATA: Vitamin C = C6H8O6 H = 1.01 g/mol C = 12.01 g/mol O = 16.00 g/mol
Calculate the number of moles of each of the reagents used: salicylic acid. 4.9 grams used Molecular Weight: 138.12 g/mol Density: 1.443 g/mL
How much serum is present in 50 micrometers if the sample is diluted 1:5? 0.4 microliters 1 microliter 10 microliters 0.2 microliters