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wariber [46]
3 years ago
12

The expression CaCO3 → CaO + CO2 is an example of a...???

Chemistry
1 answer:
nadezda [96]3 years ago
6 0
<span>The expression CaCO3 → CaO + CO2 is an example of a chemical equation, and it is a textbook one.</span>
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How many atoms of mercury are required to produce 3.49 L of H2 gas (density =
Setler79 [48]

The number of mercury atoms required to produce 3.49 L of H2 gas according to the equation would be 1.89 x 10^{23}

From the balanced equation of the reaction:

2Hg(l) + 2 HNO_3(aq) ---> Hg_2(NO_3)_2(aq) + H_2(g)

2 moles of Hg are required to produce 1 mole of the H2 gas.

3.49 L of H2 gas was produced and the density of the gas is 0.0899 g/L

Recall that: density = mass/volume

Mass of the H2 gas = density x volume

                                     = 3.49 x 0.0899

                                     = 0.3138 g of H2 gas

Mole of 0.3138 g of H2 gas = mass/molar mass

                                         = 0.3138/2

                                            = 0.1569 mole

Since the ratio of Hg to H2 according to the equation is 2:1, it means that the mole of Hg is twice the mole of H2.

Thus, mole of Hg = 0.1569 x 2

                                    = 0.3138 mole

According to Avogadro, 1 mole of a substance = 6.022×10^23

0.3138 mole would be:

                 0.3138 x 6.022 x 10^23

                            = 1.89 x 10^{23}

More on the number of atoms in molecules can be found here: brainly.com/question/19036641

6 0
3 years ago
Aluminum has a density of 2.7g/cm how much space in cm 3 would 100 grams of aluminum occupy?
PIT_PIT [208]

Answer:

fgcbcncbvh

Explanation:

vhgjhgbfjgj

8 0
3 years ago
Match the events related to the formation of the universe with the stages in which they occurred
Ira Lisetskai [31]

Answer : The chronological order events related to the formation of the universe with the stages in which they occurred are given below;

  1. Expansion from an infinitely hot point  - Which is also called as the Planck era from which the big bang theory arrived. It is assumed that from the moment of initial expansion to 10^{-43} seconds afterwards, and many also refer that it was from an infinitely hot point.
  2. Hydrogen fuses into helium  - This was called as the era of Nucleosynthesis which resulted from the Fusion and it continued in the Era of Nucleosynthesis ( which is 0.001 seconds – 3 minutes)
  3. The first neutral atom begins to form - Era of atoms, it began in around 380,000 years – 1 billion years or so.

For better understanding please refer the attachment.

3 0
4 years ago
List four metric prefixes and list what they stand for ( what they mean )
balandron [24]
A kilogram is 1,000 times larger than one gram (so 1 kilogram = 1,000 grams).
A centimeter is 100 times smaller than one meter (so 1 meter = 100 centimeters).
A dekaliter is 10 times larger than one liter (so 1 dekaliter = 10 liters)
A meter gram liter is the base unit


so. kilo-, centi, deka-, and meter grams and liters
8 0
4 years ago
F it takes 0.0500 l of oxygen gas kept in a cylinder under pressure to fill a 4.00 l vessel in which the pressure is 0.980 atm,
IgorC [24]

Answer:

0.012atm pressure

Explanation:

pressure is inversly proportional to volume. Mathematically,

V1/P1=V2/P2

7 0
2 years ago
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