E= m× C2
... than:
m=E/c 2
m=1,366•10^3/3•10 A 8 2
m=1,518•10^14 kg
At room temperature oxygen, is present in the gas phase.
A gas is defined as a substance which is characterized by the rapidly movement of molecules which are widely separated. The shape and volume of gas is not definite that is they take on the shape of the container in which it is placed. The gas molecules have minimum inter-nuclear attractions and thus have high kinetic energy.
Thus, the sentences that describes oxygen at room temperature are:
- It has no definite volume and takes the shape of its container.
- Its particles move fast enough to overcome the attraction between them.
- It has more energy than it would be at a cooler temperature as the kinetic energy is directly proportional to the temperature that is kinetic energy increases on increasing the temperature.
Answer:
0.015% and 0.012%
Explanation:
using simultaneous equation
Answer:
mass = 0.2982 grams
Explanation:
Given that;
volume = 100.0 mL = 0.1 L
Molarity =0.040 M
Since Molarity =
(x) no of moles = 0.040 × 0.1
= 0.004 moles
Also; to calculate the mass of KCl should you weigh to make this solution;
we have;
no of moles =
molar mass of KCl = 74.55 g/mol
∴
0.004 moles =
mass = 0.004 moles * 74.55
mass = 0.2982 grams
Hence, the mass of KCl should you weigh to make this solution is 0.2982 grams
The Correct choices are :
- 1. The elements have filled valence levels.
- 2. potassium (K) with a 1+ charge