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4 years ago

Which is the molar mass of BF3?

Chemistry

2 answers:

EastWind [94]4 years ago

7 0

67.82 g/mol
Hope this helps!!

yan [13]4 years ago

6 0

Answer:

67.81 g/mol

Explanation:

The molar mass is the sum of all atomic masses in the compound. For this compound the atomic masses are:

B = 10.81 g/mol

F = 19.00 g/mol

As we have 1 atom of B and 3 atoms of F, the formula to calculate the molar mass is:

BF3 Molar mass = 1(B atomic mass) + 3(F atomic mass)

BF3 Molar mass = 1(10.81 g/mol) + 3(19.00 g/mol) = 67.81 g/mol

So, the molar mass of BF3 is 67.81 g/mol

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How many grams of Ni are formed from 55.3 g of Ni2O3? 2Ni2O3(s)⟶4Ni(s)+3O2(g)

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Answer:

39.2 g

Explanation:

2Ni₂O₃(s) ⟶ 4Ni(s) + 3O₂(g)

First we convert 55.3 grams of Ni₂O₃ into moles of Ni₂O₃, using its molar mass:

55.3 g ÷ 165.39 g/mol = 0.334 mol Ni₂O₃

Then we convert 0.334 moles of Ni₂O₃ into moles of Ni, using the stoichiometric coefficients of the balanced reaction:

0.334 mol Ni₂O₃ * $\frac{4molNi}{2molNi_2O_3}$ = 0.668 mol Ni

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Ammonia and oxygen react to produce nitric oxide and water. Which of the following chemical equations describes this reaction an

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Explanation:

The reaction between ammonia, NH3 and oxygen, O2, will produce nitric oxide and water as shown below:

NH3(g) + O2(g) —> NO(g) + H2O(g)

Now, let us balance the equation.

This is illustrated below:

NH3(g) + O2(g) —> NO(g) + H2O(g)

There are 3 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of NH3 and 6 in front of H2O as shown below:

4NH3(g) + O2(g) —> NO(g) + 6H2O(g)

There are 4 atoms of N on the left side and 1 atom on the right side. It can be balance by putting 4 in front of NO as shown below:

4NH3(g) + O2(g) —> 4NO(g) + 6H2O(g)

Now, the are 2 atoms of O on the left side and a total of 10 atoms on the right side. It can be balance by putting 5 in front of O2 as shown below:

4NH3(g) + 5O2(g) —> 4NO(g) + 6H2O(g)

Now, we can see that the equation is balanced.

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