With an atomic number of 55, that means there are 55 protons. Because electrons do not count towards atomic weight, the element would have 150-55 neutrons. So, 95 neutrons.
Answer: Option (d) is the correct answer.
Explanation:
According to the given situation, mass of compound will be calculated as follows.
Mass of compound = mass of flask and condensed vapor - mass of flask
= 115.23 - 114.85
= 0.38 g
Volume (V) = 255 mL =
(as 1 ml =
)
Pressure (P) = 101325 Pa
Temperature =
= (100 + 273) K = 373 K
Now, according to the ideal gas equation, PV = nRT
and, moles of compound n =
=
= 0.008332 mol
As, molar mass of compound =
=
= 46 g/mol
Therefore, the compound is
(molar mass = 12 x 2 + 5 x 1 + 16 + 1 = 46 g/mol).
Thus, we can conclude that out of the given options the liquid could be
.
Answer:
metals can be magnetic.
Explanation:
certain types of metals are magnetic.
The answer would be A: The solution must result in a cure for skin cancer. And B: The solution must not cause harm to living organisms.
Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit