Given:
Molar mass of CO2 = 44.01g/mol
3.21x10^25 molecules of CO2
Required:
Mass of CO2
Solution:
Avogadro’s number states that for every mole of atom, there are 6.023x10^23 units of atom. The units may be formula units, atoms. In here, you need to divide 3.21x10^25 molecules of CO2 to 6.023x10^23 molecules per mole.
3.21x10^25 molecules of CO2 / 6.023x10^23 molecules per mole = 53.30 moles CO2
53.30 moles CO2 (44.01g/mol CO2) = 2346 g of CO2
2Na(s) + ZnF2(aq) + 2NaF(aq) + Zn(s)
O Fe(s) + CuCl2(aq) → FeCl2(aq) + Cu(s)
0 2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)
Answer: will not occur.
Explanation:
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.
A general single displacement reaction can be represented as :
a)
Flourine is more reactive than chlorine and hence this reaction cannot occur.
b)
Sodium is more reactive than zinc and hence the reaction will occur.
c)
Iron is more reactive than copper and hence the reaction will occur.
d)
Magnesium is more reactive than hydrogen and hence the reaction will occur.
B. a solid must dissolve in a liquid
C. the solvent must be water
D. a gas must dissolve in a liquid
Answer:
1.A
2.A
3.A
4.A
100% RIGHT
Explanation:
2 to 5 nm
5 × 10−21 m to 2 × 10−20 m
2 to 5 cm
The atomic radii is approximately between 5 × 10−11 m to 2 × 10−10 m
The covalent bonds present in based on the valence electrons and thus form 4 bonds.
The valence electrons are the number of electrons present on the last orbital of the atom.
The atomic number of carbon is 6, thereby it is given with the electronic configuration 2, 4.
There is the presence of the 4 valence electrons in the carbon atom, and thereby the number of covalent bonds formed by carbon atom is 4.
Learn more about valence electrons, here:
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