Answer:
7 grams
Explanation:
The water evaporates leaving the same amount of salt behind
hope this helps...
The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
Data;
- Volume of solution = 260mL
- conc. of HCHO2 = 2.5*10^-2M
- conc. of NaCHO2 = 2.5*10^-2M
<h3>Mass of Reagent Added</h3>
To calculate the mass of reagent added, let's start with HCHO2
The mass of HCHO2 to be added is the number of moles of HCHO2 multiplied by it's molar mass.

The mass of NaCHO2 to be added in the buffer solution is

The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively
Learn more about buffer solution here;
brainly.com/question/22390063
The nail would not be it's original color. The rust would show.
Answer:
A. Isotope
Explanation:
For example you have Carbon 12 with 6 protons and 6 neutrons and Carbon 14 with 6 protons and 8 neutrons.
Answer:
Option d. f sublevel
Explanation:
Inner transition elements includes:
Lanthanides
Actinides
Lanthanides includes elements having atomic number ranges from 52-71.
Actinides includes elements having atomic number ranges from 89-103.
Actinides and lanthanides have been placed separately in two rows below all the other elements.
General electronic configuration of lanthanides: 
General electronic configuration of actinides: 
As last electrons enters in f sub shell or sublevel, these elements are also called f-block elements.