1.Aqueous solutions of sodium and copper (II) chloride are mixed together. which statement is correct?
a. both NaCl and CuS will precipitate from solution
b. no precipitate will form
c. CuS will precipitate from solution
d. NaCl will precipitate from solution
e. no reaction will occur
2. Sorbose, C6H12O6, is used in making vitamin C. A sorbose sample containing 72.0 g of carbon atoms also contain __ g of hydrogen atoms. (show work)
3. Cu2S + O2 yields 2Cu + SO2
What mass of copper (I) sulfide is required in order to prepare 0.700 kg of copper metal?
4. The following change occurs in acidic solution: __S^2- + __Cr2O7^2- yields ____S + ___Cr3+
1. The correct statement is c. CuS will precipitate from solution.
2. To determine the mass of hydrogen atoms in the sorbose sample, we need to compare the ratio of carbon to hydrogen atoms in the compound. The formula for sorbose is C6H12O6, which means there are 6 carbon atoms and 12 hydrogen atoms. If the sample contains 72.0 g of carbon atoms, we can set up a ratio:
6 carbon atoms / 12 hydrogen atoms = 72.0 g carbon / x g hydrogen
Cross-multiplying and solving for x, we get:
6 * x = 12 * 72.0
x = (12 * 72.0) / 6
x = 144.0 g
Therefore, the sorbose sample containing 72.0 g of carbon atoms also contains 144.0 g of hydrogen atoms.
3. The balanced chemical equation is:
Cu2S + O2 -> 2Cu + SO2
From the balanced equation, we can see that 1 mole of Cu2S will yield 2 moles of Cu. We need to find the molar mass of Cu2S to calculate the amount required.
The molar mass of Cu2S = (2 * atomic mass of Cu) + atomic mass of S
Let's assume the atomic mass of Cu is 63.55 g/mol and the atomic mass of S is 32.06 g/mol.
Molar mass of Cu2S = (2 * 63.55 g/mol) + 32.06 g/mol
Molar mass of Cu2S = 160.16 g/mol
Now, we can calculate the mass of Cu2S required to produce 0.700 kg (700 g) of Cu:
Number of moles of Cu2S = (mass of Cu / molar mass of Cu) = 700 g / (2 * 63.55 g/mol) = 5.50 mol
Mass of Cu2S = (number of moles of Cu2S) * (molar mass of Cu2S) = 5.50 mol * 160.16 g/mol = 880.88 g
Therefore, 0.700 kg of copper metal can be prepared from 880.88 g of copper (I) sulfide.
4. The balanced chemical equation for this reaction in acidic solution is:
S^2- + Cr2O7^2- -> S + Cr3+
In this equation, we need to balance the number of sulfur (S) and chromium (Cr) atoms on both sides. To fill in the blanks, we must figure out the coefficients for each species.
1. In order to determine the correct statement, we need to consider the solubility of the compounds involved in the reaction. Sodium chloride (NaCl) is soluble in water, meaning it stays dissolved in the aqueous solution without forming a precipitate. On the other hand, copper (II) chloride (CuCl2) is also soluble in water, so it does not form a precipitate either.
Therefore, the correct statement is (b) "no precipitate will form." The mixture of aqueous solutions of sodium and copper (II) chloride will result in the formation of a homogeneous solution.
2. To determine the number of grams of hydrogen atoms in the sorbose sample, we need to first find the number of moles of carbon atoms present in the sample. We can then use the molar ratio between carbon and hydrogen in the compound to determine the number of moles of hydrogen.
The molar mass of carbon (C) is 12.01 g/mol, and the molar mass of sorbose (C6H12O6) is 180.18 g/mol. We can set up the following equation:
(72.0 g C6H12O6) x (1 mol C6H12O6 / 180.18 g C6H12O6) x (12 mol H / 1 mol C6H12O6) x (1.01 g H / 1 mol H) = __ g H
Solving this equation will give us the answer.
3. To determine the mass of copper (I) sulfide required, we need to know the molar mass of copper (I) sulfide (Cu2S) and the molar mass of copper (Cu).
The molar mass of Cu2S is 159.16 g/mol, and the molar mass of Cu is 63.55 g/mol. We can set up the following equation:
(0.700 kg Cu) x (1 mol Cu / 63.55 g Cu) x (1 mol Cu2S / 2 mol Cu) x (159.16 g Cu2S / 1 mol Cu2S) = __ g Cu2S
Calculating this equation will give us the mass of copper (I) sulfide required.
4. The balanced chemical equation provided is not complete, as some coefficients and reactants/products are missing. Please provide the missing information in order to answer the question.