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1. A compound whose empirical formula is CH3 has a molar mass of 30 g/mol. What is its molecular formula? (3 points)
2. Find the molecular formula for each of the following compounds: (6 points) a) 30.5% nitrogen; 69.5% oxygen; molar mass of 46 g/mol NO2 N2O4 N3O6 N5O10 N7O14 b) 2.67 g of carbon; 0.22 g of hydrogen; 7.11 g of oxygen; molar mass of 90 g/mol Hint: Start by calculating the empirical formula. 3. A gas sample of 17.0 g is constituted of 15.8 g of carbon, the rest being hydrogen. Given that the sample?s volume is 4.9 L at NTP conditions, calculate the molecular formula for this compound.(5 points) 4. A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 ?°C and 90 kPa, find the molecular formula for this compound. (5 points) 5. A compound is constituted by mass of 52.1% carbon and 13.1% hydrogen, the rest being oxygen. Given that a volume of 5.33 L of this gas has a mass of 11.5 g at 13 ?°C and 110 kPa, find the molecular formula for this compound. (5 points)
When a strip of metal (M) is brought in contact with the solution containing its own ions (Mn+), then either of the following three possible processes can take place: The meta
#question50 ml of a mixture of NH3 and H2 was completely decomposed by sparking into nitrogen and hydrogen. 40 ml of Oxygen was then added and the mixture was sparked again. After
What is heat atomisatin? Solution : Heat of atomisation or enthalpy of atomisation is the energy required to dissociate one mole of a given substance into atoms.
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when a 0.800g sample of cacl2 is dissolved in 9.85g of water in a microscale calorimeter, the temperature of the solution rose from 23.4 to 35.8
Question: a) List, with appropriate justifications, the most significant design parameters while constructing a landfill b) Draw the pattern of gas generation in a typical
1s 2 , 2s 2 , 2p 6 3s 1 shows configuration of: (1) Al 3+ in ground state (2) Ne in excited state (3) Mg + in excited state (4) None of these Ans: Mg + in
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Q. Describe the foaming properties? Foods like meringue, ice cream and beer contain foams. A number of foods possess good foaming properties on account of the proteins they con
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