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3 years ago

Explain clearly what is meant by the statement "The atomic mass of gold is 197.0 amu."

Chemistry

1 answer:

Nostrana [21]3 years ago

8 0

Answer:

Answer is given below

Explanation:

amu is atomic mass unit. 1 amu indicates (1/12) th of mass of a carbon-12 atom.

Also, 1 amu is equal to average of rest mass of a proton and a neutron. Roughly, it has been estimated that amu indicated number of nucleons (proton+neutron) in an atom.

So, 1 amu means there is 1 nucleon.

So, 197.0 amu means there are 197 number of nucleons in gold.

Again, it has to be remembered that 1 amu = 1 g/mol

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An organic compound is 61.5% C, 2.56% H and 35.9% N by mass. 2.00 grams of this gas is entered into a 300.0 mL flask and heated

pashok25 [27]

Answer:

C₄H₂N₂

Explanation:

First we calculate the moles of the gas, using PV=nRT:

P = 2670 torr ⇒ 2670/760 = 3.51 atm

V = 300 mL ⇒ 300/1000 = 0.3 L

T = 228 °C ⇒ 228 + 273.16 = 501.16 K

3.51 atm * 0.3 L = n * 0.082atm·L·mol⁻¹·K⁻¹ * 501.16 K

n = 0.0256 mol

Now we calculate the molar mass of the compound:

2.00 g / 0.0256 mol = 78 g/mol

Finally we use the percentages given to calculate the empirical formula:

C ⇒ 78 g/mol * 61.5/100 ÷ 12g/mol = 4

H ⇒ 78 g/mol * 2.56/100 ÷ 1g/mol = 2

N ⇒ 78 g/mol * 35.9/100 ÷ 14g/mol = 2

So the empirical formula is C₄H₂N₂

6 0

3 years ago

K2CrO4 is added to a solution containing lead (II) and barium ions. If a precipitate is formed, what is it?

Step2247 [10]

Answer:

Lead (II) Chromate and Barium Chromate

Explanation:

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2 years ago

When a substance is heated ,the kinetic energy of its molecules

Simora [160]

Answer:

When a substance is heated ,the kinetic energy of its molecules also increase.

Explanation:

K.E is directly proportional to T

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2 years ago

In which of the following cases does the reaction go to farthest to completion ?

Mashcka [7]

Answer:

$k=10^{3}$

Explanation:

k stand for equilibrium constants in terms of reaction

The higher the value of an equilibrium constant the faster the equilibrium reaction comes to completion.

Consider the example below:

$R_{1}\ + R_{2}$ ⇄ $P_{1}\ + P_{2}$

where

$The\ equilibrium\ constant\ K = \frac{P_{1}P_{2}}{R_{1}R_{2}}$

For a faster reaction the numerator i.e. the right hand side of the equation have to be higher than the left hand side (the denominator). therefore the higher the numerator, the higher the value of the equilibrium constant and the faster the reaction get to completion thus option c is correct.

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2 years ago

Nitrogen and hydrogen react to produce ammonia.

Doss [256]

Answer:

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3 years ago