4
I can confirm that's the correct answer
Answer:
1. Magnesium(Mg)
2.Calcium(Ca)
3.Nitrogen(N)
4.Carbon(C)
5.Mercury(Hg)
6.Gallium(Ga)
Explanation:
1.Neutral means same no. of protons and electrons which is atomic number.So element with Atomic number 12 is Magnesium.
2. No. of protons = Atomic number.So element with Atomic number 20 is Calcium.
3.Neutral means same no. of protons and electrons which is atomic number.So element with Atomic number 7 is Nitrogen.
4.C-14 isotope has two extra neutrons making it 6+2= 8 neutrons.
5.Mercury(Hg) is the name of element.
6.Gallium(Ga) and Aluminium together belongs to Aluminium family.
1) HCl + NaOH -> NaCl + H2O
2) 1 mol HCl : 1 mol NaOH: 1 mol NaCl : 1 mol H2O
3) 45.0 ml of 2.0 M HCl => M = n / V => n = M*V = 2.0 M * 0.0450 l = 0.090 moles
4) 0.090 moles of HCl => 0.090 moles of water
molar mass of water = 18.0 g/mol
mass of H2O = moles * molar mass = 0.090 mol * 18.0 g/mol = 1.62 g
Answer: 1.62 g
1 mole Ni ------------- 6.02x10²³ atoms
?? moles Ni ----------- 5x10²⁵ atoms
1 x ( 5x10²⁵ ) / 6.02x10²³ =
=> 83.05 moles
