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Sucrose (C12H22O11 FW= 342.2965) combusts in oxygen to generate carbon dioxide and water vapor. When 20-g sample of is combusted in s bomb calorimeter with a calorimeter constant of 6.595 kJ/ degrees celsius, the temperature increases from 25.0 degrees celsius to 72.21 degrees celsius. Determine the heat of formation (in kJ/mol) for sucrose { carbon dioxide and water vapor change of H, values of -393.5 kJ/mol and -241.8 kJ respectively. (Hint: you need to first write a balanced equation)
The imaginary nonmetal E has two isotopes 50E(isotopic mass 49.9715 u abundance 76.66%) 52E (isotopic mass 51.9663 u) Calculate the atomic mass of E as it would appear in the periodic table.
The calorimeter temperature rises 0.42°C. The calorimeter and water have a combined heat capacity of 32.16 kJ/K. Calculate the heat of formation of ammonia, ?H°f, in kJ/mol. The formation reaction for ammonia is: 0.5N2(g) + 1.5H2(g) ? NH3(g).
A 3.0 L bulb containing He at 129 mmHg is connected by a valve to a 2.0L bulb containing Ar at 110 mmHg. Calculate the partial pressure of each gas and total pressure after the valve between the flask is opened.
the atomic masses of 6Li and 7 Li are 6.0151 amu and 7.0160 amu. Calculate the neutral abundance of each isotope. The average atomic mass of Li is 6.941 amu
A nucleus of mass number 27 contains 14 neutrons. An atomic ion of this element has 10 electrons in it. Write the symbol for this atomic ion
the molar heat of combustion of methanol, CH3OH, is -757kJ/mol. If 2g of methanol is placed in bomb calorimeter with heat capacity of 6.5 kJ/c, what is the temperature rise when the sample is combusted?
1. a. for the following two peptides draw the chemical structure of both peptidesindicating where the peptide bonds
To what general class of mechanisms does the attack of bromide ion, Br-, on the cyclic bromonium ion
How many moles of H3O+ must be added to 170 mL of a solution to adjust the pH from 7.84 to 6.27? Use E notation and 3 significant figures.
A certain dry mixture contains only three compounds: silver nitrate ( AgNO3), magnesium chloride (MgCl2), and barium nitrate Ba(NO3)2. When 1.253 g of the mixture was added to excess water, 0.114 g of a dry precipitate was recovered by filtration...
If 22.8 mL of NO2 gas is completely converted to N2O4 gas under the same conditions, what volume will the N2O4 occupy?
Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. How many ozone molecules are present in 1.00 L of air under the stratospheric ozone conditions of 227 K temperature and 1.89 * 10^-3 atm pressure
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