To convert moles to gram multiply 3.7 moles of BaF2 to the molar mass of BaF2
BaF2 molar mass = 175.326
3.7 moles x 175.326g = 648.70g BaF2
nucleus: directs
chromosome: genetic
chloroplasts: convert energy from sun
cell membrane: controls
cytoplasm: holds
Answer:
0.128 g
Explanation:
Given data:
Volume of gas = 146.7 cm³
Pressure of gas = 106.5 Kpa
Temperature of gas = 167°C
Mass of oxygen gas = ?
Solution:
Volume of gas = 146.7 cm³ (146.7 /1000 = 0.1467 L)
Pressure of gas = 106.5 Kpa (106.5/101 = 1.1 atm)
Temperature of gas = 167°C (167 +273.15 = 440.15 K)
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
n = PV/RT
n = 1.1 atm× 0.1467 L / 0.0821 atm.L/ mol.K × 440.15 K
n = 0.1614 / 36.14 /mol
n = 0.004 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.004 mol × 32 g/mol
Mass = 0.128 g
The best answer is (3)
In these kind of reactions, there is a transfer of electrons from one reactant to another. electrons are lost from one substance and gained by another.
Oxidation is loss of electrons from a substance, and Reduction is gain of electrons by a substance.
These two processes cannot occur without the other. If there is a reduction there must be an oxidation reaction and vice versa. The reactions usually occur simultaneously.
For example, table salt is formed by a redox reaction. Sodium is oxidized i.e. loses an electron (and becomes positively charged) while chlorine gas is reduced i.e. gains the electron (and become negatively charged). The result is formation of sodium chloride.
Answer:
Explanation:
Please, find the image with the pictured molecule for this question attached.
The molecule has one oxygen atom (red) covalently bonded to one hydrogen atom (light grey), one nitrogen atom (blue) covalently bonded to two hydrogen atoms (light grey), and two carbon atoms (dark grey) bonded each to two hydrogen atoms (light grey).
<em>Hydrogen bondings</em> are intermolecular bonds (bonds between atoms of two different molecules not between atoms of the same molecule). The hydrogen bonds are attractions between the positive end of one hydrogen atom and the negative end of a small atom of other molecule (N, O, or F).
Since, nitrogen and oxygen are much more electronegative than hydrogen atoms, you conclude that:
- The two hydrogen atoms covalently bonded to the nitrogen atoms have considerably partial positive charge.
- The hydrogen atom covalently bonded to the oxygen atom also has a a relative large partial positive charge.
So, those are three ends of the molecule that can form hydrogen bonds with water molecules.
The hydrogen bondings are only possible when hydrogen is covalently bonded to N, O or F atoms.
