The diagram below represents a beaker of water being heated by a flame. The arrows represent heat

Calculate the empirical formula for each of the following substances. (Express answer as a chemical formula) 1) 2.90 g of Ag and

exis [7]

Answer:

1) Ag3N

2)Na2S

3)NaHSO4

4) KNO3

Explanation:

We divide each mass by the element's relative atomic mass

1) 2.90/108-Ag, 0.125/14-N

0.027-Ag, 0.0089-N

Divide by the lowest ratio

0.027/0.0089-Ag, 0.0089/0.0089 N

3-Ag, 1-N

Empirical formula- Ag3N

2)2.22/23-Na, 1.55/32-S

0.097-Na, 0.048-S

Divide by the lowest ratio

0.097/0.048-Na, 0.048/0.048-S

2-Na, 1-S

Empirical formula- Na2S

3) 2.11/23-Na, 0.0900/1-H, 2.94/32-S,5.86/16-O

0.09-Na, 0.09-H, 0.09-S,0.366-O

Divide by the lowest ratio

0.09/0.09-Na, 0.09/0.09-H, 0.09/0.09-S, 0.366/0.09-O

1-Na, 1-H, 1-S, 4-O

Empirical formula- NaHSO4

4)1.84/39, 0.657/14-N, 2.25/16-O

0.047-K, 0.047-N, 0.14-O

Divide through by the lowest ratio

0.047/0.047-K, 0.047/0.047-N, 0.14/0.047-O

1-K, 1-N, O-3

Empirical formula- KNO3

4 0

2 years ago

How long would it take for 1.50 mol of water at 100.0 ∘c to be converted completely into steam if heat were added at a constant

Aleksandr-060686 [28]

To determine the time it takes to completely vaporize the given amount of water, we first determine the total heat that is being absorbed from the process. To do this, we need information on the latent heat of vaporization of water. This heat is being absorbed by the process of phase change without any change in the temperature of the system. For water, it is equal to 40.8 kJ / mol.

Total heat = 40.8 kJ / mol ( 1.50 mol ) = 61.2 kJ of heat is to be absorbed

Given the constant rate of 19.0 J/s supply of energy to the system, we determine the time as follows:

Time = 61.2 kJ ( 1000 J / 1 kJ ) / 19.0 J/s = 3221.05 s

5 0

2 years ago

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Identify the nuclide produced when plutonium-239 decays by alpha emission: 239 94pu→42he + ? express your answer as an isotope u

Galina-37 [17]

1. Answer is ₉₂²³⁵U

Since this is an alpha emission the atomic number of the daughter nucleus decreases by 2 while mass number decreases by 4 compared to parent atom. Since parent atom has 94 as atomic number the daughter atom should have 94 - 2 = 92 as atomic number and 239 - 4 = 235 as mass number. 

₉₄²³⁹Pu → ₂⁴He + ₉₂²³⁵U

2. Answer is ₉₁²³⁴Pa

Since this is a beta emission, a neutron is converted into a proton while emitting an electron. Hence atomic number increases by 1 compared to mass number but mass number remains as same. Hence, the atomic number of the daughter atom should be 90 + 1 = 91 which belongs to Pa. But the mass number is same as 234.

₉₀²³⁴Th → ₋₁⁰e + ₉₁²³⁴Pa

3. Answer is ₈¹⁸O

Since this is a positron emission, a proton is converted into a neutron while emitting an positron. Hence atomic number decreases by 1 compared to mass number but mass number remains as same. Hence, the atomic number of the daughter atom should be 9- 1 = 8 which belong to O. But the mass number is same as 18.

₉¹⁸F → ₊₁⁰e + ₈¹⁸O

4. Answer is ₈₀²⁰¹Hg

This is an electron capture decay. A proton is converted into a neutron by emitting a gamma ray. In this process mass number remains as same as parent atom which is 201, but the atomic number is decreased by 1 than parent atom. Hence atomic number of daughter nucleus is 81 -1 = 80 which belongs to Hg.

₈₁²⁰¹Tl + ₋₁⁰e → ₀⁰γ + ₈₀²⁰¹Hg

6 0

2 years ago

Which environmental factor could lead to a decrease in genetic variation in a population of tuna? A.an increase in food availabi

LekaFEV [45]

Hello there!

Your question is asking: Which environmental factor could lead to a decrease in genetic variation in a population of tuna?

The correct answer is B. An increase in pollution

8 0

2 years ago

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A mixture containing KClO3,K2CO3,KHCO3, and KCl was heated, producing CO2,O2, and H2O gases according to the following equations

Nikitich [7]

Answer:

For 1: The mass of $KClO_3$ in the original mixture is 10.46 g