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n200080 [17]
3 years ago
7

A car is traveling 150 km in 7200 s what is the speed of the car

Chemistry
1 answer:
noname [10]3 years ago
3 0
Speed = Distance divided by time
Speed = 150 km / 7200 s
Speed = 1 km / 48 s
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Why do health care professionals limit the number of radiation treatments that a person can be given
katovenus [111]
Radiation is s very powerful substance and can cause major health problems do the health care professionals limit the use to help not create sickness
6 0
3 years ago
How many moles are in 2.6 x 10 ^25 atoms of Li?​
Cerrena [4.2K]

Answer:

43 mole

Explanation:

Given data:

Number of atoms of Li = 2.6× 10²⁵ atoms

Number of moles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.6× 10²⁵ atoms × 1 mole / 6.022 × 10²³ atoms

0.43 × 10² mole

43 mole

5 0
3 years ago
I'm afraid I won't pass. And very nervous. Can you help me please.
daser333 [38]
Just look at the number in front also called coefficient (you have to balance the equations first, but all the questions here are balanced, so no worries). for q1.
in the balanced equation, the number in front of aluminum oxide is 2 (2 - this number Al2O3) and for aluminium is 4 as in (4 Al). so the ratio is 2:4. simplified it is 1:2. or write it out fully
2 Al2O3: 4 Al
ignore everything after the number.
2:4
same as 1:2
Aluminium oxide to oxygen
2 Al2O3: 3 O2
2:3
aluminum to oxygen
4 Al: 3 O2
4:3

question 2
Mercury oxide to Mercury
2 HgO : 2 Hg
2:2
same as 1:1
Mercury oxide to oxygen
2 HgO : O2
since oxygen in this case does not have a number written in front of it, the default is 1.
2: 1.
you should be able to do the rest
4 0
3 years ago
How many atm are 12920 torr
Zinaida [17]

Answer:

17 atm

Explanation:

3 0
3 years ago
How does La Niña affect the climate of the Pacific Ocean?
Shkiper50 [21]
2. the cold water sinks deeper into the ocean
6 0
3 years ago
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