A sample of calcium phosphate was found to have a mass of 125.3 g. How many molecules were contained in the sample?

The answer for the following problem is mentioned below.

Explanation:

Given:

mass of calcium phosphate ( ) = 125.3 grams

We know;

molar mass of calcium phosphate  ( ) = (40×3) + 3 (31 +(4×16))

molar mass of calcium phosphate  ( ) = 120 + 3(95)

molar mass of calcium phosphate  ( )  = 120 +285 = 405 grams

We also know;

No of molecules at STP conditions() = 6.023 × 10^23 molecules

To solve:

no of molecules present in the sample(N)

We know;

N÷

=

N =(405×6.023 × 10^23) ÷ 125.3

N = 19.3 × 10^23 molecules

Therefore number of molecules(N) present in the calcium phosphate sample are  19.3 × 10^23 molecules

1 a

2 d

3 a

4 c

explanation:

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.