1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
siniylev [52]
3 years ago
10

A sample of 2.0 moles of a metal reacts completely with excess oxygen to form 62.0 g of M2O. What element is represented by the

symbol M?
Chemistry
1 answer:
lana66690 [7]3 years ago
5 0
1) State the chemical reaction

4M + O2 ---> 2M2O

2) State the molar ratios

4 mol M : 1 mol O2 : 2 mol M2O

3) Calculate the number of moles of M2O produced

4 mol M / 2 mol M2O = 2 mol M / x => x = 2 mol M * 2 mol M2O / 4 mol M

=> x = 1 mol M2O

4) Calculate the molar mass of M2O

molar mass = mass in grams / number of moles = 62.0 g / 1 mol = 62.0 g/mol

5) Calculate the atomic mass of M

molar mass of M2O = 2 * atomic mass of M + atomic mass of O =>

62.0 = 2 * atomic mass of M + 16

=> atomic mass of M = [62.0 - 16] / 2 = 23

6) Compare that atomic mass with the atomic masses of the metals in the periodic table.

You will find that 23 is the atomic mass of sodium.

Answer: sodium


You might be interested in
Large mountain ranges rising up from the ocean floor are called
mote1985 [20]

Answer:

c mid ocean ridges

Explanation:

google def-A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.

a basin is like a bowl and a plain is flat.

7 0
3 years ago
Read 2 more answers
HELPPPPPPPP <br> I NEEED TO PASS
Monica [59]
I believe it might be c I might wrong
7 0
3 years ago
Read 2 more answers
I in the blanks.<br>The solid substance left on the filter paper is called​
horsena [70]

Explanation:

the solid substance which left on the filter paper is called Residue

3 0
3 years ago
When bases dissolve in water they release what type of negative ion?
Leto [7]
A base generally releases a hydroxide ion (OH-) when dissolved in water. 

There are exceptions, such as ammonia NH3, which acts as a base but does not produce OH- ions. There are three definitions of acids and bases (Arrhenius, Bronsted-Lowry, and Lewis) and each one looks at acid/base characteristics differently. OH- donation is the Arrhenius definition.
4 0
4 years ago
What is the symbol for halogen on the periodic table? can u please help me????
Phantasy [73]

Answer:

F

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • The heat of fusion of water is 80 cal/<br> g. How much energy is needed to melt 0.05 kg of ice?
    5·1 answer
  • What is a graph?
    13·1 answer
  • What will the pressure of H+ ions in a solution cause
    5·1 answer
  • explain how fossils and other materials can tell us about the conditions of an area at the time it existed.
    7·1 answer
  • What are the empirical formula and empirical formula mass for N2S3
    15·1 answer
  • At 40 degrees Celsius , 100 grams of NaClO3 is added to 100 grams of water. The solution would be ..
    6·1 answer
  • Which of these would produce a soft sound A (a slow vibration) B (a big vibration) C (a fast vibration) or D (a tiny vibration)
    5·1 answer
  • What is the molarity of 2 moles of a compound dissolved in 4 L of water?
    15·1 answer
  • Any liquid or material that is likely to catch fire should be kept away from a
    11·1 answer
  • When washing items in the detergent solution when do you replace the water.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!