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3 years ago

What would cause the percent yield of a reaction to be less than 100%?

Chemistry

1 answer:

Roman55 [17]3 years ago

3 0

Answer:

All of the limiting reagent gets used up causes the percent yield of a reaction to be less than 100%

Explanation:

It is rare for a chemical reaction to occur with the right proportion of reactants that reacts together to form resultant products.During this process, one of the reactants gets used up faster resulting in the lower percent yield. Such product that gets used up faster is called limiting reagent. This limiting reagent is responsible for lowering the percentage yield in the chemical reaction.

The limiting reactant can be found easily by calculating the yield of each reactant assuming they are consumed completely. The reactant which has least yield is the limiting reactant of the reaction.

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3 years ago

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3 years ago

How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution? Group of answer choices 1.25 × 10-2

Hitman42 [59]

Answer:

$n_{HCl|=1.25\times 10^{-2}\ moles$

Explanation:

We know that , the reaction between NaOH and HCl is given as

$HCL+NaOH\rightarrow NaCl+H_2O$

Form the above reaction we can say that

Number of moles of HCl =Number of moles of NaOH

$n_{HCl} =n_{NaOH}$

Therefore

$n_{HCl}=\frac{0.25\times 50}{1000}\ moles$

$n_{HCl|=12.5\times 10^{-3}\ moles$

$n_{HCl|=1.25\times 10^{-2}\ moles$

Therefore the numbers of moles needed of HCl wil be $1.25\times 10^{-2}\ moles$

6 0

3 years ago

An atom that has fewer neutrons than protons and more electrons than protons is a(n)

Umnica [9.8K]

Answer:

A solution that has fewer neutrons than protons and more electrons than protons is a negative ion. 

Explanation:

Atoms in their original state have equal number of protons and electrons. The subatomic particles that take part in reaction are electrons. When the electrons of an atom involve in a reaction an atom may lose or gain electrons and reach ionic state.

Ions can be positively charged or negatively charged and the charge acquired depends on whether electrons are gained or lost. The process of losing electrons make an atom a positively charged ion and gaining electrons make an atom a negatively charged ion. 

In this case the number of electrons is more than the number of protons which means there is an excess of negative charge and the atom has become a negatively charged ion. 

8 0

3 years ago

What is the mass of a CuCl2 sample if it contains 0.172 moles of the compound?

Delvig [45]

Answer:

Mass of CuCl₂ = 23.125 g

Explanation:

Given data:

Number of moles of CuCl₂ = 0.172 mol

Mass of CuCl₂ = ?

Solution:

First of all we will calculate the molar mass of CuCl₂.

Molar mass of CuCl₂ = 63.546 + 2(35.5)

Molar mass of CuCl₂ = 134.45 g/mol

Formula:

Number of moles = mass / molar mass

Mass = Number of moles × molar mass

Mass = 0.172 mol × 134.45 g/mol

Mass = 23.125 g

5 0

3 years ago