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LekaFEV [45]
3 years ago
11

Using the periodic table, find the molecular mass of H2. H2 = g/mole

Chemistry
1 answer:
alekssr [168]3 years ago
5 0
MH₂ = 2×mH = 2×1g = 2 g/mol
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A gas has a volume of 560 mL at a temperature of –55°C. What volume will the gas occupy at
kap26 [50]

Answer: 778 ml

Explanation:

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

\frac{V_1}{T_1}=\frac{V_2}{T_2}

where,

V_1\text{ and }T_1 are the initial volume and temperature of the gas.

V_2\text{ and }T_2 are the final volume and temperature of the gas.

We are given:

V_1=560ml\\T_1=-55^oC=(273-55)K=218K\\V_2=?\\T_2=30.0^oC=(273+30.0)K=303K

Putting values in above equation, we get:

\frac{560ml}{218K}=\frac{V_2}{303K}\\\\V_2=778ml

Thus volume the gas occupy at 30.0°C is 778 ml

7 0
3 years ago
Water absorbs energy when it undergoes___
k0ka [10]
Water absorbs energy D. Melting
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3 years ago
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Hi! It would be awesome if you could answer this soon. 20 points!
NikAS [45]

Answer:

2HgO    →     2Hg      +  O₂

The reaction is a decomposition reaction because from one reactant two products were obtained

Explanation:

The problem here involves balancing the chemical reaction given and also classifying the reaction.

 The unbalanced expression is given as:

              HgO    →     Hg      +  O₂

Assign the alphabets a,b and c as coefficients that will balance the equation

           aHgO    →     bHg      +  cO₂

Conserving Hg: a  = b

                   O:    a  = 2c

So, let c  = 1, a  = 2 b  = 2

Therefore;

       2HgO    →     2Hg      +  O₂

The reaction is a decomposition reaction because from one reactant two products were obtained

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3 years ago
Put the elements in order from the highest electronegativity at the top of your list, to the lowest at the bottom.
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Br
Se
As
Ge
Ga
Rb
Elements in the top right corner of the periodic table have the highest electronegativity. Elements on the right side have a higher electronegativity than those on the left, same with the ones on the top in comparison to those on the bottom. 
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3 years ago
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Where is the intersection of the position and time axes located on a position-versus-time graph?
Bad White [126]

it is located at the origin so A

hope this helped ^_^

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