CHEMISTRY HIGH SCHOOL

What is the molar mass of a substance

Answers

Answer 1
Answer:

Molar mass of a molecule is the sum of the atomic mass of the individual elements in the molecule.  

Atomic mass of Pb = 207  amu

Atomic mass of N = 14  amu

Atomic mass of O = 16  amu

Here amu stands for atomic mass unit

Molar mass of Pb(NO₃)₂ = 207 + [14 + (16 x 3)] x 2  

                                         = 207 + 28 + (48) x 2 = 331 g/mol  
Answer 2
Answer: The mass of an element in the periodic table

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How many grams of oxygen would be produced by the electrolysis of 72.0 grams of water ? 2H2O--> O2+2H2 (Must be made to fit into the chart underneath #8)
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Hydrochloric acid (HCl) is combined with cesium hydroxide (CsOH) in a neutralization reaction. Which ions will combine to form a salt? Check all that apply.H+
H3O+
Cl-
Cs+
OH-

Answers

HCl + CsOH --> CsCl + H2O

So the ions making up the salt: Cl- and Cs+

Answer:

The answers are C and D

Explanation:

The molarity of an aqueous sodium phosphate solution is 0.650 M. What is the molality of sodium ions present in this solution? The density of solution is 1.43 g/mL.

Answers

Answer:

molality of sodium ions is 1.473 m

Explanation:

Molarity is moles of solute per litre of solution

Molality is moles of solute per kg of solvent.

The volume of solution = 1 L

The mass of solution = volume X density = 1000mL X 1.43 = 1430 grams

The mass of solute = moles X molar mass of sodium phosphate = 0.65X164

mass of solute = 106.6 grams

the mass of solvent = 1430 - 106.6 = 1323.4 grams = 1.3234 Kg

the molality = (moles of solute)/(mass of solvent in kg)=(0.65)/(1.323)= 0.491m

Thus molality of sodium phosphate is 0.491 m

Each sodium phosphate of molecule will give three sodium ions.

Thus molality of sodium ions = 3 X 0.491 = 1.473 m

What is the total number of protons contained in the nucleus of a carbon 14 atom

Answers

A carbon 14 atom would have two more neutrons than a carbon 12 atom but they would both still have 6 protons

Precipitation _____. occurs equally all over the globe is the change in state from a gas to a liquid happens when ice changes into water vapor exceeds evaporation over land

Answers

Answer;

exceeds evaporation over land

Precipitation exceeds evaporation over land

Explanation;

  • In order to maintain earths water balance, evaporation exceeds precipitation over oceans but precipitation exceeds evaporation over land.
  • Water evaporates into the atmosphere from the ocean and to a much lesser extent from the continents. Winds transport this moisture-laden air, often great distances, until conditions cause the moisture to condense into clouds and to precipitate and fall.
  • Most precipitation originates by evaporation from the oceans. Over time, water evaporated from the oceans is replenished by inflow of freshwater from rivers and streams.

All atoms try to achieve---------------(minimum energy,stable energy,maximum energy,covalent energy)

Answers

Answer:

minimum energy

Explanation:

minimum energy means maximum stability

please mark me brainliest

A solution of hydrogen peroxide, H2O2, is titrated withpotassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4
+ 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L
KMnO4 to titrate 50.0 mL of the solution of H2O2. What is the mole per liter
concentration of H2O2 in the solution?

Answers

5H2O2 + 2KMnO4+ 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4

0,145 moles of KMnO4----------in--------1000ml
x moles of KMnO4---------------in------------46ml
x = 0,00667 moles of KMnO4

according to the reaction:
2 moles of KMnO4------------------5 moles of H2O2
0,00667 moles of KMnO4----------------x
x = 0,01668 moles of H2O2

0,01668 moles of H2O2---------in-----------50ml
x moles of H2O2--------------------in----------1000ml
x = 0,334 mol/L H2O2
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The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below.3H2 + N2 mc025-1.jpg 2NH3 The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures? 0.1 0.102 0.10209 0.1021