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A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.
- a)6.7 gm
- b)7.6 gm
- c)4.6 gm
- d)5.6 gm
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When...
Concept:
- The Specific gravity of a substance is the ratio of its density to the density of water.
- A substance with a specific gravity of less than 1 will float in water. For example, an ice cube, with a relative density of about 0.91, will float. A substance with a specific gravity greater than 1 will sink.
- Whereas the relative density of a substance is defined as the ratio of densities of any two-sample, it can be expressed as
- Archimedes' principle states that when a body immersed in a fluid, whether fully or partially submerged, the upward buoyant force that is exerted on it, is equal to the weight of the fluid that the body displaces.
- Buoyant force: When an object is submerged in fluid fully or partially, an upward force is exerted on the body. This force is known as the buoyant force.
Calculation:
Given:
Mass of water displaced = 12.9 - 11.3 = 1.6 g
⇒ Volume of water displaced = mass / density = 1.6/1 = 1.6 cm3
We know that,
Relative density = density of substance / density of water
Since density of water = 1 g/cm3
⇒ Density of copper = 8.9 g/cm3
Let the mass of copper in 12.9 gram of alloy is x
Volume of water displaced by the copper = x/8.9 cm3
Similarly,
⇒ Density of zinc = 7.1 g/cm3
Also, the mass of zinc in alloy = 12.9 - x
Volume of water displaced by zinc = (12.9- x)/7.1 cm3
Hence total water displaced by the alloy,
Solving we get,
x = 7.614 gm.
Hence the mass of copper in the alloy is 7.614 gm.
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A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer?
Question Description
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer?.
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer?.
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A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water weighs 11.3 g. what is the mass of copper contained in the alloy? Specific gravities of copper and zinc are 8.9 and 7.1 respectively.a)6.7 gmb)7.6 gmc)4.6 gmd)5.6 gmCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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