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Chemistry

2 answers:

pentagon [3]3 years ago

6 0

The 02 is a solid. I hope thus helped you :)

HACTEHA [7]3 years ago

6 0

Answer:

Product

Explanation:

In representing chemical reactions with equations, the following are some general rules

reactants are written on the left
products are written on the right
catalysts are written on the arrow
the states of each molecules involved are written as subscripts in brackets. Where "aq" stands for aqueous, "l" stands for liquid, "g" stands for gas" and "s" stands for solid

From the above points, it can be deduced that hydrogen peroxide (H₂O₂) is the reactant but this reaction also suggests that H₂O₂ is been broken down (most likely thermally) since it is the only reactant and we have two products. O₂ gas and H₂O are the products in this reaction.

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How many molecules are in 7.62 L of CH4, at 87.5°C and 722 torr

pickupchik [31]

Answer: There are $1.469 \times 10^{23}$ molecules present in 7.62 L of $CH_4$ at $87.5^{o}C$ and 722 torr.

Explanation:

Given : Volume = 7.62 L

Temperature = $87.5^{o}C = (87.5 + 273) K = 360.5 K$

Pressure = 722 torr

1 torr = 0.00131579

Converting torr into atm as follows.

$722 torr = 722 torr \times \frac{0.00131579 atm}{1 torr}\\= 0.95 atm$

Therefore, using the ideal gas equation the number of moles are calculated as follows.

PV = nRT

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

$PV = nRT\\0.95 atm \times 7.62 L = n \times 0.0821 L atm/mol K \times 360.5 K\\n = \frac{0.95 atm \times 7.62 L}{0.0821 L atm/mol K \times 360.5 K}\\= \frac{7.239}{29.59705}\\= 0.244 mol$

According to the mole concept, 1 mole of every substance contains $6.022 \times 10^{23}$ atoms. Hence, number of atoms or molecules present in 0.244 mol are calculated as follows.