01 mol, the mass of a gas is 0. 44 g, the molar mass of the gas is 0 Just ask the second question for density

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• 1. How can we deduce C (mass concentration) = 1000 × ρ (density) × w (mass fraction) / M (molar mass)
• 2. How to deduce the formula (mass concentration of substance = 1000 * density * mass fraction / molar mass)?
• 3. What is the expression of mass concentration of solute in a solution with mass fraction W and density ρ of solute (m)?
• 4. How to calculate the quantity, concentration, formula, the kind of density
• 5. Solution equation: 1 / 3 plus 2x = 2 / 5x minus 1 / 6 Solution equation: 1 / 3 plus 2x = 2 / 5x minus 1 / 6 It's one-third plus 2x. One plus 2x is a molecule
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• 7. x+√3x²=1000
• 8. After connecting the two bulbs marked with 220 V 200 W and 220 V 40 W in series into the 380 V circuit, what will burn out is, help. 0 points Then I calculate that the IE 200 / 220 of a is 0.909, the IE of B is 40 / 220 = 0.182, the resistance of a is 242, the resistance of B is 1210, the total current of the circuit is 380 / (1210 + 242) = 0.26, because 0.26 is greater than 0.909 and 0.1818, so the two lamps are burned out. What's wrong with me? After connecting the two bulbs marked with 220 V 200 W and 220 V 40 W in series into the 380 V circuit, what will burn out is, help Then I calculate that the IE 200 / 220 of a is 0.909, the IE of B is 40 / 220 = 0.182, the resistance of a is 242, the resistance of B is 1210, the total current of the circuit is 380 / (1210 + 242) = 0.26, because 0.26 is greater than 0.909 and 0.1818, so the two lamps are burned out. What's my fault?
• 9. 17 degrees 23 points - 3 degrees 27 points how to calculate the process
• 10. The resistance R1 is connected in a circuit, and the consumed electric power is P1. The other resistance R2 is connected in series with it. The electric power of R2 is P2, P1: P2 = 36:5, and R1 > R If resistance R1 is connected in a circuit, the consumed electric power is P1, and another resistance R2 is connected in series with it in the same circuit, the consumed electric power of R2 is P2, P1: P2 = 36:5, and R1 > R2, then R1: R2 =?
• 11. Why is the ratio of gas density equal to the ratio of molar mass at the same temperature and pressure?
• 12. Calculation of gas molar mass by density method under standard condition M = V ρ = 22.4l/molx ρ standard
• 13. At the same temperature and pressure, the molar mass ratio of two gases is equal to the density ratio. Can you teach me the formula?
• 14. The formula for calculating the average molar mass is: the ratio D of the density of the gas mixture to the density of another gas a is known at the same temperature and pressure Then d = ρ (mixed) / ρ (a) = m (mixed) / M (a),
• 15. How to express the conversion relationship among molar mass, mass and mass?
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• 19. Are Archimedes law and Archimedes principle the same concepts? If they are different, please tell us the difference,
• 20. Xiaodong wants to estimate the density of some kind of oil, ρ oil. The measuring tool he has is only a scale. Xiaodong uses the equipment around him to design an experimental scheme. First, find a straight hard rod, hang it at o point with a thin line, and the hard rod is balanced in the horizontal position. Then hang the metal block B with known density of ρ at C on the left end of the hard rod, and find a weight a at the right end of the hard rod, and adjust the weight a At this time, the position of the weight hanging on the hard rod is e, as shown in the figure. The following is part of the experimental steps for Xiaodong to measure ρ oil. Please complete the experimental steps according to Xiaodong's experimental ideas (1) Measure the length l0 of OE with a scale; (2) immerse the metal block B in the oil to be measured, and move the weight a from e to D, and the hard rod will be balanced in the horizontal position again; (3)___ (4) the formula for calculating ρ oil by using the physical quantity measured above and the known quantity in the question is as follows:___ ．