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Alona [7]
3 years ago
14

11. How much magnesium reacts with 12.5g of oxygen to produce 31.5g of 5 points

Chemistry
1 answer:
AfilCa [17]3 years ago
6 0
Your answer should be C.
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Hydrogen peroxide is commonly used to clean cuts and wounds. Its chemical formula is
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Why is scientific notation important in chemistry?
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The density of air under ordinary conditions at 25°C is 1.19 g/L. How many kilograms of air are in a room that measures 10.0 ft
Lunna [17]

Answer: The mass of air present in the room is 37.068 kg

Explanation :  Given,

Length of the room = 10.0 ft

Breadth of the room = 11.0 ft

Height of the room = 10.0 ft

To calculate the volume of the room by using the formula of volume of cuboid, we use the equation:

V=lbh

where,

V = volume of the room

l = length of the room

b = breadth of the room

h = height of of the room

Putting values in above equation, we get:

V=10.0ft\times 11.0ft\times 10.0ft=1100ft^3=31148.53L

Conversion used : 1ft^3=28.3168L

Now we have to calculate the mass of air in the room.

Density=\frac{Mass}{Volume}

1.19g/L=\frac{Mass}{31148.53L}

Mass=37066.7507g=37.068kg

Conversion used : (1 kg = 1000 g)

Therefore, the mass of air present in the room is 37.068 kg

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3 years ago
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Air is made up of about 21% oxygen and 78% nitrogen.
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