I think 3 of them are its been 1 half years since ive done this i dont take chemistry anymore
In order to determine the number of protons in 20.02 mol of Ne, we use Avogadro's number to convert the number of moles to number of atoms, 1 mol = 6.022 x 10^23 atoms. From there, we must know the number of protons in a Neon atom, which is 10. Thus, the formula will be:
(20.02 mol Ne)x(6.022 x 10^23 atoms/mol)x(10 protons/1 atom Ne) =
1.2056 x 10^26 protons
Answer:
1.Legs
2.Arms and hands
3.Armor
4.Skeletal
5.Carpenters
6.Brain
7.Skin
8.Blood
Explanation:
You can google dem and it will show you all the answers
The answer is Argon (Ar).
Answer:
Br
Explanation:
Given data:
Mass of gas = 0.239 g
Volume of gas = 100 mL
Pressure exerted by gas = 603 mmHg
Temperature of gas = 14 °C
What is gas = ?
Solution:
Volume of gas = 100 mL (100mL ×1 L/1000 mL= 0.1 L)
Pressure exerted by gas = 603 mmHg (603/760 = 0.79 atm)
Temperature of gas = 14°C ( 14+273 = 287 K)
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
now we will calculate the number of moles.
n = PV/RT
n = 0.79 atm × 0.1 L / 0.0821 atm.L/ mol.K × 287 K
n = 0.079 /23.563 /mol
n = 0.003 mol
Molar mass of gas:
Number of moles = mass/molar mass
0.003 mol = 0.239 g/ molar mass
Molar mass = 0.239 g/ 0.003 mol
Molar mass = 79.7 g/mol
The molar mas of Br is 79.9 g/mol so it is closer to 79.7 thus given gas is Br.
