All categories

3 years ago

Mass number is

Chemistry

2 answers:

Gwar [14]3 years ago

6 0

The answer is D . Tu é man

saul85 [17]3 years ago

3 0

Answer:

4 th is the answer......

You might be interested in

Determine which statement is true. A) Electrons travel around the nucleus in circular orbits. B) The Bohr atom is the model curr

krek1111 [17]

Answer:

A. True

B. True

C. False

D. False

Explanation:

Electrons travel around the nucleus in circular orbits and moves from one orbit to another orbit when they absorb energy or lose energy. The Bohr atom is the model currently accepted for electrons in atoms because this model provides the right information about presence of electrons around the orbits. Scientists know the energies of electrons as well as the areas (orbitals) where the electrons are probably located with the help of new technology.

3 0

3 years ago

In a(n) _____ contract, the powerful party dictates the terms of the agreement and eliminates the other party’s free will.

Lesechka [4]

I honestly think it would be a victor contract..

6 0

3 years ago

Which polyatomic ion has a charge of 3-?

skad [1K]

Most of the common inorganic polyatomic ions have negative charges. This means the ion has more electrons than the neutral atoms that are in the ion. A polyatomic ion like phosphate, PO43- has three extra electrons beyond the electrons on the P and O atoms. Got this off google sorry if it doesn't help you :(

6 0

3 years ago

When HSO4- disassociates in water, it is a reversible reaction. Is it correct to say that \"in this reaction HSO4- disassociates

SVETLANKA909090 [29]

When an ion HSO4- disassociates in water, the dissociated ions are H+ and SO4-. When you balance the equation, it is composed of one mole of each dissociated ions. Hence it is correct to say that HSO4- dissociates into H+ and SO4-. Answer is correct.

4 0

3 years ago

A metallurgical firm needs to dispose 2.77 of gallons of waste sulfuric acid whose concentration has been determined to be 2.10

Alchen [17]

Answer:

It will cost 1.9$ to neutralize the waste sulfuric acid

Explanation:

Step 1: The neutralization reaction

H2SO4(aq) + Ca(OH)2 (s) → CaSO4(s) + 2H2O

Step 2: Calculate the molar mass of Ca(OH)2

Molar mass of Ca = 40.08 g/mole

Molar mass of O = 16 g/mole

Molar mass of H = 1.01 g/mole

Molar mass of Ca(OH)2 = 40.08 + 2*16 + 2*1.01 =74.1 g/mole

Step 3: Convert gallons to liters

2.77 gallons of H2SO4 = 10.48559 Liters H2SO4

Step 4: Calculate number of moles of H2SO4

Molarity = moles / liters

2.10 M = moles / 10.48559L

number of moles = 2.10 * 10.48559 =22.02 moles

Step 5: Calculate the number of moles of Ca(OH)2

H2SO4(aq) + Ca(OH)2 (s) → CaSO4(s) + 2H2O

For 1 mole of H2SO4 consumed we need 1 mole of Ca(OH)2

This means we need 22.02 moles of Ca(OH)2

Step 6: Calculate mass of Ca(OH)2

mass of Ca(OH)2 =number of moles * Molar mass of Ca(OH)2

mass of Ca(OH)2 = 22.02 moles * 74.1 g/moles = 1631.682 grams

Step 7: Convert grams to pounds

1631.682 grams/ 453.592 = 3.5972 pounds

Step 8: Calculate the cost

price Price per pound = 0.53$

Price for 3.5972 pounds = 0.53 * 3.5972 = 1.906516 ≈1.9$

It will cost 1.9$ to neutralize the waste sulfuric acid

3 0

3 years ago