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Sati [7]
3 years ago
11

A classroom has a volume of 278 m3. What is its volume in km3

Chemistry
2 answers:
borishaifa [10]3 years ago
8 0

Answer:

Explanation:

1m3 = (10-3 km)3

1m3 = 10-9 km3

285m3 x 1 km3 = 2.78 x 10-7 km3

_____     ______

  1m3      10-9 m3

Tcecarenko [31]3 years ago
3 0
1 m = 0,001 km
1m³ = 0,000000001 km³

278 m³ = 0,000000278 km³ = 2,78×10^(-7) km³

:•)
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Number of grams of hcl that can react with 0.500 grams of Al(OH)3
vlabodo [156]

Answer:

0.7g of HCl

Explanation:

First, let us write a balanced equation for the reaction between HCl and Al(OH)3.

This is illustrated below:

Al(OH)3 + 3HCl —> AlCl3 + 3H2O

Next, let us obtain the masses of Al(OH)3 and HCl that reacted together according to the equation. This can be achieved as shown below:

Molar Mass of Al(OH)3 = 27 + 3(16+1)

= 27 + 3(17) = 27 + 51 = 78g/mol.

Molar Mass of HCl = 1 + 35.5 = 36.5g/mol

Mass of HCl from the balanced equation = 3 x 36.5 = 109.5g

Now we can obtain the mass of HCl that would react with 0.5g of Al(OH)3. This can be achieved as follow:

Al(OH)3 + 3HCl —> AlCl3 + 3H2O

From the equation above,

78g of Al(OH)3 reacted with 109.5g of HCl.

Therefore, 0.5g of Al(OH)3 will react with = (0.5 x 109.5)/78 = 0.7g of HCl

7 0
3 years ago
To protect yourself from consuming too much _____, you should limit your consumption of swordfish, king mackerel, and shark. a.
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Answer:

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5 0
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2 years ago
At the beginning of an experiment, a scientist has 176 grams of radioactive goo. After 165 minutes, her sample has decayed to 5.
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An = Aoe^-kt

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k = 0.02
<span>What is the half-life of the goo in minutes? 
</span>
0.5 = e^-0.02t
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