In an experiment, 7.84 g of sulphuric acid reacts with potassium carbonate. H2SO4 + K2CO3 —> K2SO4 + H2O + CO2 Calculate: the mass of potassium carbonate consumed (11.0g)
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- Using the information in the table below, calculate the heat of released from the following reaction in kJ per g of NO. ( Mw. Of NO = 30.01 g/mol). 4NH3(g) + 5O2 (g) 6H2O(g) + 4 NO(g) NH3 H2O NO Hfº (kJ/mol) - 46.1 -241.8 + 90.3Calcium citrate; MM=498.46 g/mol, a common preservative, has a Ksp of 1.12 x 10^-15 at 25°C.Which of the following does not have DHof=0 at 25oC? N2(g) Cu(s) Kr(g) Hg(s) H2(g) I2(S)
- How much heat (in kilocalories) is evolved or absorbed in the reaction of 1.21 g of Na with H2O?2Na(s)+2H2O(l)→2NaOH(aq)+H2(g), ΔHΔH = -88.0 kcalkcal (-368 kJ)A 27 g aluminum foil pan is used to roast vegetables. The pan is put into a cold oven at 22 oC . How much energy in cal is absorbed by the pan after cooking at 232 oC (450. oF) for 25 minutes?A sample of a hydrocarbon is combusted completely inO2(g) to produce 21.83 g CO2(g), 4.47 g H2O(g), and 311 kJ ofheat. (a) What is the mass of the hydrocarbon sample thatwas combusted? (b) What is the empirical formula of thehydrocarbon? (c) Calculate the value of ΔHf° per empirical formulaunit of the hydrocarbon. (d) Do you think that thehydrocarbon is one of those listed in Appendix C? Explainyour answer.
- Calculate the heat required when 2.50 mol of A reacts with excess B and A2B according to the reaction:2A + B + A2B → 2AB + A2Given(on the photo):At least 25 μg of tetrahydrocannabinol (THC), the activeingredient in marijuana, is required to produce intoxication.The molecular formula of THC is C21H30O2. Howmany moles of THC does this 25 μg represent? How manymolecules?Liquid menthonal (CH4O) which is used as a cooking fuel, burns with oxygen gas to produce the gases carbon dioxide and water. The reaction produces 363 kJ of heat per mole of methonol. a) write a balanced equation for the reaction includig the heat of the reaction b) is the reaction endothermic or exothermic? c) How many moles of O2 must react with 0.450 mole of CH4O? d) How many grams of CO2 are produced when 78.0 g of Ch4O reacts?
- when a 0.55-g of olive oil is burned in a calorimeter the hear released increases the temperature of 360 g of water from 22.7 c to 36.4 c . what is the energy value for the olive oil in kcal/g?Methane, CH4, reacts with oxygen to produce carbon dioxide, water, and heat. CH4(g) + 2O2(g) CO2(g) + 2H2O(l) ΔH = – 890.3 kJ What is the value of ΔH if 5.00 g of CH 4 is combusted?For items 1-3, refer to the equation: CH4(g) + 2O2(g) → 2H2O(l) + CO2(g), with ΔH equal to -809.94 kJ/mol.1. Is the reaction heat-producing (exothermic) or heat-absorbing(endothermic)?2. How many moles of liquid water (H2O(l)) will be produced upon combustion of 3 moles of methane gas (CH4(g))?3. Calculate the ΔH if 5g of methane gas was combusted. With solutions and explanation.