15 days ago

When a pan containing liquid and solid water (ice water) is put over the flame of a stove and stirred vigorously 1. the temperat

ure starts to rise immediately. 2. the temperature rises but only after the ice melts. 3. the temperature rises slowly at first then more and more rapidly?

Chemistry

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An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100

lorasvet [2795]

To find the answer, start by calculating the total mass of the copper utilized:

Copper used = 100 pennies x 3.0g Cu per penny = 300.0 g Cu

Next, identify the path and molar ratios from Cu produced back to CuFeS2 needed using the established balanced reactions:

1 Cu2S from 2 CuS; 2Cu from 1 Cu2S; 2CuS from 2CuFeS2
Thus, 2Cu comes from 2CuFeS2, indicating a 1:1 molar ratio.

Then convert grams of Cu to moles and grams of CuFeS2:
= 300.0 g Cu * 1 mol Cu/63.546g Cu * 2 mol CuFeS2/2 moles Cu

= 4.72 moles CuFeS2

The required amount of chalcopyrite mined = 4.72 moles CuFeS2 * 183.54 g CuFeS2/1 mole CuFeS2 = 866.49 g CuFeS2

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Which of the following substances would release the most amount of heat when they cool from 50oC to 25oC if you started with equ

lions [2927]

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What would be the mass in grams of 1.204 x 1024 molecules of sulfur dioxide

Tems11 [2777]

mass of sulfur = 96 g no of moles of sulfur dioxide in $1.204\times 10^{24}$ molecules = $\frac{1.204\times 10^{24}}{avagadro number }= \frac{1.204\times 10^{24}}{6.023\times 10^{23}}$ = 2 moles therefore mass of sulfur dioxide = moles × atomic number = 2 × (16 + 32) = 96

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