how many moles of water are produced from 19.2 g of B2H6

mB₂H₆: 2×11g+6×1g= 28 g/mol
...................
B₂H₆ + 3O₂ ---> 2HBO₂ + 2H₂O
28g.......................................2 mol......

28g B₂H₆ ---- 2 mol H₂O
19,2g B₂H₆ --- X
X = (2×19,2)/28
X = 1,37 mol H₂O

Answer Link

jamuuj jamuuj · Answer 2 · 2019-08-21T15:28:42+02:00

19.2 g of B2H6 will produce 1.39 moles of water

Further Explanation

Moles, Atomic mass and Molecular mass

1 mole of a pure substance contains a mass that is equal to the relative atomic mass or molecular mass of the substance.

Therefore; molar mass is given as grams per mole of a substance
Hence;

Molar mass = mass of a substance/ Number of moles

g/mol = g /mole

Thus:

M = m/n; where M is the molar mass, m is the mass and n is the number of moles

From this relationship we can therefore, calculate mass by multiplying the number of moles by molar mass of a substance.

That is; Mass = moles x molar mass

To calculate number of moles;

We have; n = m/M

Number of moles = Mass of the substance/ Molar mass

In this question;

The equation for the reaction is;

B₂H₆ + 3O₂ → 2HBO₂ + 2H₂O

Step 1; Moles of B₂H₆

Molar mass of B₂H₆ is 27.66964 g/mol

Therefore;

Number of moles = Mass/molar mass

= 19.2 g/27.66964 g/mol

= 0.6939 moles B₂H₆

Step 2: Moles of H₂O

Mole ratio; 1 mole B₂H₆ produces 2 moles of H₂O

Therefore;

Moles of H₂O = 0.6939 moles x 2

= 1.3878 moles

= 1.39 moles of H₂O

Keywords: Moles, Molar mass, mole ratio

Learn more about:

Relative atomic mass: https://brainly.com/question/4079113
Moles calculation: https://brainly.com/question/4079113
Molar mass: https://brainly.com/question/4079113

Level: High school

Subject: Chemistry

Topic: Moles

Sub-topic: Moles, Molar mass