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STALIN [3.7K]
3 years ago
10

Bridget is in science class. Her teacher gives her two unknown substances and asks her to determine their relative pH. She place

s a piece of red litmus paper into both substances. The litmus paper turns purple when she places it into substance I. The litmus paper turns blue when she places it into substance II.
Which of the following is true about the relative pH of the two substances?
A.
Substance I is an acid and substance II is a base.
B.
Substance I is a neutral substance and substance II is a base.
C.
Substance I is a base and substance II is a neutral substance.
D.
Substance I is a neutral substance and substance II is an acid.
Chemistry
1 answer:
pav-90 [236]3 years ago
4 0

Answer:

d dddddddddd

Explanation:

STUDY STUPID ISLAND

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What is the percent yield for the reaction below when
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Answer:

Percent yield of reaction is<em> 150%.</em>

Explanation:

Given data:

Percent yield = ?

Actual yield of SO₃ = 586.0 g

Mass of SO₂ = 705.0 g

Mass of O₂ = 80.0 g

Solution:

Chemical equation:

2SO₂ + O₂      →     2SO₃

Number of moles of SO₂:

Number of moles = mass/ molar mass

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Number of moles of O₂:

Number of moles = mass/ molar mass

Number of moles = 80.0 g/ 32g/mol

Number of moles = 2.5 mol

Now we will compare the mole of SO₃ with O₂ and SO₂.

                      SO₂          :          SO₃

                        2             :            2

                     9.1              :           9.1

                       O₂            :          SO₃

                        1              :            2

                     2.5             :           2×2.5 = 5

The number of moles of SO₃ produced by oxygen are less it will limiting reactant.

Theoretical yield of SO₃:

Mass = number of moles × molar mass

Mass = 5 mol × 80.1 g/mol

Mass = 400.5 g

Percent yield of reaction:

Percent yield = actual yield / theoretical yield  × 100

Percent yield = 586.0 g/ 400.5 g× 100

Percent yield = 1.5× 100

Percent yield = 150%

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