Helppp, I'm stressinggg. Brainliest and 36 points. 1) 150.0 grams of HNO3 are dissolved to make 0.500 L of solution. Find the molarity.

2) A student has 12.0 M HCI and needs to make 9.00L of 4.00 HCI. What volume of the concentrated acid is needed?

3) 40.0 grams of NaCI are dissolved to make 2.00 L of solution. Find the molarity.

4) if 50.0 mL of water are added to 250.0 mL of a 0.500 M K2SO4 solution what will the molarity of the diluted solution be?
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maybe might be ;b i don't know

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.  

the awnser is group 12