61.8 % is the mass percentage of magnesium sulphate.
Explanation:
The mass percent of individual solute or ion in a compound is calculated by the formula:
Grams of solute ÷ grams of solute + solvent × 100
mass percent of magnesium is calculated as 1 mole of magnesium having 24.305 grams/mole will have weight of 24.305 grams and 1 mole of MgSO4 will have 120.366 grams
Putting the values in the equation:
24.305 ÷ 144.671 × 100
= 16.8% of magnesium is in the mixture
The mass percentage of SO4 is calculated as
= 96.06 ÷ 216.426 × 100
= 44.38 %
The mass percentage of the mixture MgSO4 is 44.38 + 16.8 = 61.8 %
Mass percentage is a representation of the concentration of element or elements in a compound.
B. Platinum does not react with oxygen at room temperature.
C. The page of the textbook is white.
D. The copper sheets that form the "skin" of the Statue of Liberty
have acquired a greenish coating over the years.
A chemical property is a characteristic observed during a reaction where the substance's chemical composition changes. In the provided options, 'Platinum does not react with oxygen at room temperature' and 'The copper sheets of the Statue of Liberty have acquired a greenish coating over the years' are chemical properties.
In Chemistry, a chemical property is a characteristic that is observed during a reaction in which the chemical composition or identity of the substance is changed. Taking a look at the options provided:
So, the correct answers are options B and D. Both entail a change or lack of change in the chemical identity of a substance.
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Answer:
The specific heat of the alloy is 2.324 J/g°C
Explanation:
Step 1: Data given
Mass of water = 0.3 kg = 300 grams
Temperature of water = 20°C
Mass of alloy = 0.090 kg
Initial temperature of alloy = 55 °C
The final temperature = 25°C
The specific heat of water = 4.184 J/g°C
Step 2: Calculate the specific heat of alloy
Qlost = -Qwater
Qmetal = -Qwater
Q = m*c*ΔT
m(alloy) * c(alloy) * ΔT(alloy) = -m(water)*c(water)*ΔT(water)
⇒ mass of alloy = 90 grams
⇒ c(alloy) = the specific heat of alloy = TO BE DETERMINED
⇒ ΔT(alloy) = The change of temperature = T2 - T1 = 25-55 = -30°C
⇒ mass of water = 300 grams
⇒ c(water) = the specific heat of water = 4.184 J/g°C
⇒ ΔT(water) = The change of temperature = T2 - T1 = 25 - 20 = 5 °C
90 * c(alloy) * -30°C = -300 * 4.184 J/g°C * 5°C
c(alloy) = 2.324 J/g°C
The specific heat of the alloy is 2.324 J/g°C
C.Only CuS will precipitate from solution
Aqueous solutions of sodium sulfide and copper(II) chloride are mixed together.
Na₂S(aq) + CuCl₂(aq) → Products
Na₂S(aq) + CuCl₂(aq) → CuS(s) ↓ + 2NaCl(aq)
When the sulfide bond to the cation Cu²⁺ it makes a precipitate (s)
Thus,the correct answer is C.
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Answer:
The correct state for the answer is c.
Only CuS will precipitate from solution
Explanation:
We analyse the compounds for the reaction and we write the equation:
Na₂S(aq) + CuCl₂(aq) → Products
For this case, the products are NaCl and CuS. The complete balanced reaction is:
Na₂S(aq) + CuCl₂(aq) → CuS(s) ↓ + 2NaCl(aq)
When the sulfide bond to the cation Cu²⁺ it makes a precipitate (s)
Salts from chlorides are soluble except for the Ag⁺, Pb⁺ or Cu⁺
Salts from S⁻² which are soluble, are found in the group 2 of the Periodic Table (Ca²⁺, Ba²⁺, Mg²⁺)
The correct state for the answer is c.
Answer:
2 HCl
Explanation:
Please kindly check attachment for the step by step solution of the given problem.
OB. only the important elements that exist in the world.
OC. only the important compounds that exist in the world.
OA. all the known elements that exist in the world today.