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padilas [110]
3 years ago
9

7. Elements in group one are called.​

Chemistry
1 answer:
Aleks [24]3 years ago
3 0

Answer:

The answer is alkali metals

Explanation:

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How many moles of nitrogen are in 81.0 grams of nitrous oxide?
9966 [12]
1 mole of NO2= 7 + (8×2)= 7 + 16 = 23g

81g of NO2 = 81÷23 = 3.5217

Ans = 3.5 moles ...//
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3 years ago
If heat is released from water, what phase change occurs?
gizmo_the_mogwai [7]
Melting phase, the ice is melting into water.
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4 years ago
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A 41.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100 K with a volume of 3.4 L. If the containe
Morgarella [4.7K]

Answer:

The pressure inside the container is 6.7 atm

Explanation:

We have the ideal gas equation: P x V = n x R x T

whereas, P (pressure, atm), V (volume, L), n (mole, mol), R (ideal gas constant, 0.082), T (temperature, Kelvin)

Since the container is evacuated and then sealed, the volume of the body of gas is the volume of the container.

So we can calculate the pressure by

P = n x R x T / V

where as,

n = 41.1 g / 44 g/mol = 0.934 mol

Hence P = 0.934 x 0.082 x 298 / 3.4 L = 6.7 atm

3 0
3 years ago
On.<br> pe. Where is the Hubble telescope located?
Lubov Fominskaja [6]

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space

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6 0
4 years ago
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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766
Marina CMI [18]

The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

average atomic mass = \Sigma {percent abundance}\times {atomic mass}

Substituting the values in the formula:

average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}

average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}

average atomic mass = \frac{20721.688371}{100} = 207.22 amu

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is Pb. The atomic number of Pb is 82.

So, the the most common isotope of lead can be written as:

_{207.22}^{82}Pb and Lead - 207.22 amu.

3 0
3 years ago
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