Question

сплав міді з оловом містить 60% олова. до 2,5 кг цього сплаву додали 2,5 кг чистого олова і одержали новий сплав. знайдіть у відсотках вміст міді в новому сплаві. плиз помогите пожалуйста, очень надо хотя бы до завтра. пж даю много балов​

Answer 1

Ответ:

2.5

2.5*60%=2.5*0.6=1.5кг олова

2.5-1.5= 1кг міді

1.5+2.5= 4 кг олова

$\frac{1*1}{5} =0,2 = 20$%

Пошаговое объяснение:

Answer 2

To find the percentage of copper in the new alloy, we can use the concept of mass conservation. The total mass of the alloy before and after adding pure tin should remain the same.

Let's assume the initial mass of the alloy is 100 kg, and it contains 60% tin. This means that the mass of tin in the initial alloy is 60 kg, and the mass of copper is 40 kg.

When 2.5 kg of pure tin is added to the alloy, the total mass becomes 102.5 kg. The mass of tin in the new alloy is now 62.5 kg (60 kg from the initial alloy + 2.5 kg added), and the mass of copper remains the same at 40 kg.

To find the percentage of copper in the new alloy, we can calculate the ratio of the mass of copper to the total mass of the alloy and multiply it by 100.

Percentage of copper in the new alloy = (mass of copper / total mass of alloy) * 100

Using the values we calculated earlier: Percentage of copper in the new alloy = (40 kg / 102.5 kg) * 100 = 39.02%

Therefore, the new alloy contains approximately 39.02% copper.

Please note that the calculations are based on the assumption that the total mass of the alloy remains constant and that there are no other impurities or changes in the composition during the process.