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(1)Town gas is produced from coal. (2)Town gas contains hydrogen as the major component. (3)Oxygen is added to enhance the flammability of town gas prior to its delievery to consumers. (2) and (3) are correct. That means there is O2 in town gas,why H2 for
The fact that some carbon dioxde is produced when the residue is treated with acid means that there is a carbonate present. 2. If 50% of the mixture is magnesium carbonate (relative mass = 84) and it decomposes to MgO (relative mass 40), then the 50% loses 44/84 x 100 % of its mass = 52.4% so the mass loss of the 100% mixture = 26.2% BUT, this ...
A certain mass of an ideal gas is in a sealed vessel of volume 3.25 dm3. At a temperature of 25.0ºC, it exerts a pressure of 101 kPa. What pressure will it exert at 100ºC? Any help will be appreciated!
Calculate the relative molecular mass of a gas which has a density of 2.615g dm-3 at 298K and 101kPa Ok so I’ve got the working out and the answer but I want to know why the volume is 1dm-3 V= 1dm-3 Moles = pV/rt Moles = 101000*(1/1000) / 8.31*298 Moles = 0.0408 Mass= density * volume Mass = 1*2.615 Mass= 2.615 Mr = mass /moles Mr= 2.615 / 0.0408 Mr = 64.09 I understand the working out and ...
A student carries out a titration to determine the molar mass of an unknown acid, A. The student dissolves 2.24 g of acid A in distilled water and makes the solution up to 250.0 cm3. The student titrates a 25.0 cm3 portion of this solution with 0.120 mol dm–3 NaOH. 25.25 cm3 of 0.120 mol dm–3 NaOH are required to reach the end point.
2021年1月22日 · The diameter of the lumen (hole) of the capillary tubing was 1 mm. The volume of a capillary tubing is given by πr2l, where π is 3.14 and l = length. Calculate the volume of gas produced in cm3 hour–1. Show your working. So in 1 hour it moves 1.5/24 cm which is the length. 1mm equals 0.1cm so that is the diameter.
No, really. She had decent GCSE grades and they assumed that someone with brains wouldn't stick around for long, because they'd never be a very permanent member of staff, and were capable of getting a better job. Obviously they didn't use the phrase 'someone with brains', haha.
2023年3月5日 · This discussion is now closed. A Level Geography Edexcel 18/20/24 markers. Hello, you need to use specific examples with data from your case studies, and interweave this with your point and argument. Get familiar with the specification and the terminology so that you know which section the exam question comes from and can write about the ...
2021年11月3日 · 10. The gas equation is pV=nRT. From what we know is volume, temperature, gas constant (R) and pressure. in order to find RMM we need both mass and moles and we have mass as well. RMM= Mass/no. of moles. Now we need to sort out the units. volume must be in m^3 so 2.615/1000 = 2.615x10^-3. pressure in pa not kpa so 101kpa = 101000pa.
2020年7月11日 · They should be banned from all town and city centres, allowing people to walk and cycle in peace.’ Write a letter to the Minister for Transport arguing your point of view on this statement. (24 marks for content and organisation) (16 marks for technical accuracy) [40 marks] Dear Minister for Transport I urgently need your support and trust to assist in making this country exceptional again.
