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luda_lava [24]
4 years ago
10

PLEASE HELP ASAP WILL MARK BRAINLIEST

Chemistry
2 answers:
irga5000 [103]4 years ago
8 0
It atomic number is 78, and the element is Platinum (Pt)
Its atomic mass is 195.078

hope this helps please mark brainliest
goldenfox [79]4 years ago
4 0
Keep in mind that atomic number is the number of protons in the atom of the element. Therefore, in the case where there are 78 protons, we can conclude that the atomic number of this element is ALSO 78. 

Let me know if you need anything else. 

                   - Dotz 
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Convert 645 Newtons per quart to tons per liter. (The picture is a conversion table for help)
brilliants [131]

Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

7 0
4 years ago
Which temperature represents the highest average kinetic energy of the particles in a sample of matter ?
Genrish500 [490]

Answer: Option C is correct.

Explanation: Average kinetic energy is directly proportional to the absolute temperature. Higher the temperature means higher the kinetic energy.

Average kinetic energy is given by:

K.E._{avg}=\frac{3kT}{2}

Where, k = Boltzman constant

T = Temperature

We are given different temperatures, so to compare they all should have the same units.

a) 298K

b) 267K

c) 27°C = 273+27 = 300K

d) 12°C = 273+12 = 285K

Looking at the temperature values, C part will have the highest average kinetic energy.

3 0
3 years ago
Read 2 more answers
How many valence electrons are these ​
charle [14.2K]

Answer:

6 valance electrons

Explanation:

3 0
4 years ago
What Li(s) + O2(g) -> Li2O(s) balanced is
Ivahew [28]

Answer:

<h2>4 1 2</h2>

Explanation:

4 Li(s) + 1 O2(g) -> 2 Li2O(s)

3 0
3 years ago
How many moles of nitrogen are in 66.0 g of nitrous oxide?
KIM [24]
Rmm of N20 = (14X2) + 16 = 44
Percentage by mass of Nitrogen in N20 = 28/44x100 = 63.64
66x0.6634 = 43.7844g of Nitrogen in 66g of N20
Moles = Mass/Mr = 43.7844/14 = 3.13 moles
5 0
4 years ago
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