A block measures (3cm x 2cm x 4cm). The mass is. What is 48g. What is the density of the object? A. 24g/cm^3

B. 0.5g/cm^3

C. 2 g/cm^3

D. 72 g/cm^3

2g/cm³

Explanation:

Given parameters:

Dimension of the block = 3cm x 2cm x 4cm

    Volume of block  = 3cm x 2cm x 4cm  = 24cm³

Mass = 48g

Unknown:

Density of the object = ?

Solution:

Density is the mass per unit volume of a substance. It is expressed as;

  Density  =  

So;

  Density  =   = 2g/cm³

particle   p is an electron and particle q is a neutron

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol