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aivan3 [116]
3 years ago
13

Where would you find the element with least mass?

Chemistry
1 answer:
dexar [7]3 years ago
8 0
C. The lowest mass will be the element in period 1, group 1 (this element is hydrogen)

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77.In the early days of automobiles, illumination at night was provided by burning acetylene, C2H2. Though no longer used as aut
natta225 [31]

Answer:

554.86kj

Explanation: Since 1 mole of CaC2=15.14kj yield 1mole of C2H2

The enthalpy change of H2O is 2*285=570

570+-15.14=554.86kj

Hence Hp is 554.86kj

He=Hp

3 0
3 years ago
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7 H2SO4<br> what is the coefficient?<br> what are the subscript numbers?
baherus [9]

Answer:

Coefficient: number balancing sulfuric acid in a chemical reaction.

Subscripts: number of atoms of each element forming the compound.

Explanation:

Hello!

In this case, since sulfuric acid is a molecule containing hydrogen, sulfur and oxygen in the following way:

- Two hydrogen atoms.

- One sulfur atom.

- Four oxygen atoms.

We can notice the 2 at H represents those two hydrogen atoms, the subscriptless S represent that 1 sulfur atom and the 4 at O represents those four oxygen atoms.

Moreover, since the molecules is given as 7 H2SO4 ; from stoichiometry, we infer that every number preceding the molecule stands for a coefficient which is used to balance a undergoing chemical reaction reaction.

Best regards!

3 0
2 years ago
The density of a gas is 1.25 grams/liter. Which of the following is correct to convert the density of the gas to ounce/millilite
vlada-n [284]
I am pretty positive that the answer is letter A
6 0
3 years ago
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True or false: all of the rivers in the united states are closely monitered for pollution levels
timofeeve [1]

Answer:It is false!

Explanation:

8 0
3 years ago
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The energy-level diagram shown here can be continued to higher energies. The next few orbitals, in order of increasing energy, a
Maru [420]

The bond order of Mg2 molecule is given by:

Mg2 = 4e⁻= 3σs(2e⁻) 3σs*(2e⁻) 3σp(0) 3πp(0e⁻) 3πp*(0e⁻) 3σp*(0e⁻)

Bond Order = ½[Σ (bonding e-) - Σ (antibonding e-)]

bo = ½[ {σs(2e⁻)} - {σs*(2e⁻)}] = 0

the bond between Mg2 molecules are ionic bonding and it stable.

7 0
3 years ago
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