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-Dominant- [34]
3 years ago
6

How many moles of HNO3 are present in 450 g of HNO3?

Chemistry
1 answer:
iVinArrow [24]3 years ago
6 0
Since there are 63.01284 grams to one mole of HNO3, then 12.5 moles would be in 450 grams of it.
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Which regions of the world seem to be suffering most from loss of species ?
Lana71 [14]

Answer:

The most dangerous area for animals and plants is the one that contains the greatest biodiversity on the planet: Southeast Asia. In this region are the five most affected countries in the world: Malaysia, Brunei, Singapore, Indonesia and Thailand. The Atlantic rainforests of Brazil are also very affected, this is due to the fact that great catastrophes have occurred in these places lately, such as the massive fire in the Amazon, and the floods that occurred after the tremendous absence of vegetation that these places suffered.

Explanation:

Also on the other hand, the regions with the highest extinction are those that carry out little environmental policies where care has not been taken for species that are in danger of extinction, as happens, for example, in those islands such as the Galapagos Islands, which are subject to severe fines for harm turtles.

3 0
2 years ago
How many atoms is 50 g of He?
tigry1 [53]
Atomic <span>mass He = 4.002 u.m.a

4.002 g --------------- 6.02x10</span>²³ atoms
50 g ------------------ ? atoms

50 x ( 6.02x10²³) / 4.002

= 3.01x10²⁵ / 4.002

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6 0
3 years ago
. Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely:
barxatty [35]
A. HCl:
pH= -log [H3O+]
PH=-log (0.200)
= 0.699

poH= 14-0.699
= 13.301

b. NaOH:
PoH= -log [OH-]
= -log (0.0143)
= 1.845
pH= 14-poH
= 14- 1.845
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c. HNO3:
PH= -log[H3O+]
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poH= 14-pH
= 14-9-0.4771
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pH= -0.4771, poH= 14.4771

d. [Ca(OH)2] = 0.0031M
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[OH-] = 0.0062M

PoH= - log[OH-]
=-log(0.0062)
=-log(6.2x10-3)
=-(-2.21)
= 2.21
PH=14-poH
=14-2.21
=11.79
POH=2.21, PH= 11.79
5 0
2 years ago
Which statement describes a cycle of Earth's surface?
lord [1]
The answer is .......


<span>A.Nitrogen from the atmosphere is used and replaced directly by plants on the surface.
</span>
hope it helps yall!


have a great one! :)



5 0
3 years ago
Read 2 more answers
Explain how the complexity and diversity of living things has changed over time
Oduvanchick [21]

Answer:

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4 0
2 years ago
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