Question

density of iron is 7.8 gm/cc, it's volume is 40 cm3 . calculate the mass of the iron pice.​

Answer 1

Explanation:

7.8 /, ' 40 3 . .

Answer 2

Answer

• Mass of Iron piece is 312 grams

Given

• Density of Iron 7.8 gm/cc, it's volume is 40 cm³

To Find

• Mass of the Iron piece

Formula

Density of an object is defined as ratio of mass and volume

$\bigstar\;\;\; \bf Density=\dfrac{Mass}{Volume}$

• SI unit of Density is Kg/m³
• SI unit of Mass is Kg
• SI unit of volume is m³
• CGS unit of Density is g/cm³
• CGS unit of Mass is g
• CGS unit of Volume is cm³

Solution

Density of Iron , D = 7.8 gm/cc [ Note : cc = cubic centimeters ]

Volume , V = 40 cc

Mass of Iron , m = ? g

Apply formula

$\implies \rm Density=\dfrac{Mass}{Volume}\\\\\implies \rm D=\dfrac{m}{V}\\\\\implies \rm 7.8=\dfrac{m}{40}\\\\\implies \rm m=312\ g$