A sample of CH$N3O4 has a mass of 7.81 g. How many grams of oxygen are...
How many grams of water are produced when a 4 g sample of methane CH is burned according to the balanced equation? CH + 2 O → CO + 2 HO A 3.6 g B 4.5 g C 7.4 g D 9 g E 18 g
6.0 grams hydrocarbon sample were made to react with oxygen gas to produce 17.6 grams of carbon dioxide according to the equation: CxHy(g) + O2(g) ---------- CO2(g) + H20(l) where x = subscript for C, y = subscript for H a. How many grams of C are there in 17.6 grams of CO2? b. How many grams of C are there in the hydrocarbon sample? c. How many moles of C are there in the hydrocarbon sample? d. How many...
14. A sample of oxygen gas has a volume of 4.50 L at 27°C and 800.0 torr. How many oxygen molecules does it contain? A) 1.16 x 1023 B) 5.8 x 1022 C) 2.32 x 1024 D) 1.16 x 1022 E none of these
Avogadro's number & the mole Stoichiometry How many grams of oxygen are contained in 4.50 mol of oxygen gas? Write a problem solving strategy first. A. 144 g B. 64.0 g
30. A 4.98 g sample of aniline (C6H5NH2, molar mass - 64.3 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ???comb for aniline. A. +7.81 x 103 kJ/mol B. -3.20 x 103 kJ/mol Cytl .71 x 103 kJ/mol D.-1.71 x 103 kJ/mol E. -7.81 x 103 kJ/mol Given w - 0, an exothermic reaction has the following. A. +?? and-AE
1. Choose the correct answer(s) to complete the following statement: One mole of oxygen (O2) gas is equivalent to _____________________. I. 6.022 × 1023 molecules of oxygen II. 6.022 × 1023 atoms of oxygen III. one mole of oxygen atoms IV. two moles of oxygen atoms 2. 50.0 g of Cl2 contains ________ mol Cl2. a. 0.705 b.1.41 c. 4.24 × 1023 d. 1775 e. 50.0 3. The number of grams in 0.350 mol of Na is a. 11.0. b....
4. Find the mass, in grams, of 4.21 x 1023 molecules of N2 5. How many particles are there in 2.34 g of a molecular compound with a gram molecular mass of 233 g? T2 6. Aspartame is an artificial sweetener that is 160 times sweeter than sucrose (table sugar) when iissolved in water. It is marketed by G.D. Searle as Nutra Sweet. The molecular formula of aspartame is C14H18N205 a) Calculate the gram-formula-mass of aspartame. To ed b) How...
How many grams of water are produced when a 4 g sample of methane CH is burned according to the balanced equation? CH + 2 O → CO + 2 HO
The oxygen gas (O2) in a cylinder has a mass of 360 grams. How many moles of oxygen are present in the cylinder?
A sample of iodine has a mass of 36.5 grams. How many I atoms are there in the sample? How many I2 molecules are there in the sample? molecules A sample of chlorine has a mass of 37.0 grams. How many atoms are there in the sample? How many Cl2 molecules are there in the sample?