The density of a solid gold at room temperature is 19.3 g/mL. Given a 45-mg sample of gold, what is the volume in mL?

Volume is 0.00233mL

Explanation:

Hello,

The density of a substance is the mass per unit volume of that substance.

Density = mass / volume

To solve this question, we need to get our data first.

Data;

Density = 19.3g/mL

Mass = 45mg = 0.045g

Volume = ?

Density = mass / volume

Density (ρ) = mass (m) / volume (v)

ρ = m / v

v = m / ρ

v = 0.045 / 19.3

v = 0.00233mL

The volume of the substance is 0.00233mL

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.