What is the expression of mass concentration of solute in a solution with mass fraction W and density ρ of solute (m)?

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• 5. 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?
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• 7. 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 =?
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• 9. In the experiment of measuring resistance RX by volt ampere method, we use the circuit as shown in the figure to measure. The measurement result is expressed by dividing the reading of voltmeter by the reading of ammeter. As electrical appliances, voltmeter and ammeter have resistance, which will cause experimental error. (1) before the power is turned on, the slide of sliding rheostat should___ (select "left end", "right end" or "any position"); (2) the measured value is higher than the true value___ (select "too large", "too small" or "same"); (3) if the readings of voltmeter and ammeter are u and I respectively, and their own resistances are RV and RA respectively, the more accurate expression of Rx is___ (mathematical expressions are expressed in known letters)
• 10. Three fourths of a number is 72, and five eighths of a number is ()
• 11. How to deduce the formula (mass concentration of substance = 1000 * density * mass fraction / molar mass)?
• 12. How can we deduce C (mass concentration) = 1000 × ρ (density) × w (mass fraction) / M (molar mass)
• 13. 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
• 14. Why is the ratio of gas density equal to the ratio of molar mass at the same temperature and pressure?
• 15. Calculation of gas molar mass by density method under standard condition M = V ρ = 22.4l/molx ρ standard
• 16. 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?
• 17. 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),
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