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2 years ago

Which measurement contains three significant figures?

2 answers:

8 0

The answer is C because you don’t have to worry about the number in front of the decimal unless it is something greater than zero. A- Doesn’t have there sig figs. B- The zero after the 5 doesn’t change it. D- The three at the end doesn’t matter because it does not round it up.

nadezda [96]2 years ago

3 0

A i think a is right 0.05

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Given the following reaction:

Semenov [28]

Answer:

The answer to your question is 0.35 moles of ZnCl₂

Explanation:

Data

moles of ZnCl₂ = ?

mass of Zn = 23 g

mass of CuCl₂ = excess

Balanced chemical reaction

Zn + CuCl₂ ⇒ ZnCl₂ + Cu

Process

1.- Convert the mass of Zn to moles

-Look for the atomic mass of Zn

Atomic mass = 65.4 g

-Convert the grams to moles

65.4 g -------------- 1 mol

23 g ---------------- x

x = (23 x 1)/65.4

x = 23 / 65.4

x = 0.35 moles of Zn

2.- Calculate the moles of ZnCl₂ using proportions and cross multiplication, and the coefficients of the balanced chemical reaction.

1 mol of Zn ---------------- 1 mol of ZnCl₂

0.35 moles of Zn -------- x

x = (0.35 x 1) / 1

x = 0.35 moles of ZnCl₂

7 0

3 years ago

0.0200 M Fe3+ is initially mixed with 1.00 M oxalate ion, C2O42-, and they react according to the equation: Fe3+(aq) + 3 C2O42-(

Studentka2010 [4]

Answer : The concentration of $Fe^{3+}$ at equilibrium is 0 M.

Solution : Given,

Concentration of $Fe^{3+}$ = 0.0200 M

Concentration of $C_2O_4^{2-}$ = 1.00 M

The given equilibrium reaction is,

$Fe^{3+}(aq)+3C_2O_4^{2-}(aq)\rightleftharpoons [Fe(C_2O_4)_3]^{3-}(aq)$

Initially conc. 0.02 1.00 0

At eqm. (0.02-x) (1.00-3x) x

The expression of $K_c$ will be,

$K_c=\frac{[[Fe(C_2O_4)_3]^{3-}]}{[C_2O_4^{2-}]^3[Fe^{3+}]}$

$1.67\times 10^{20}=\frac{(x)^2}{(1.00-3x)^3\times (0.02-x)}$

By solving the term, we get:

$x=0.02M$

Concentration of $Fe^{3+}$ at equilibrium = 0.02 - x = 0.02 - 0.02 = 0 M

Therefore, the concentration of $Fe^{3+}$ at equilibrium is 0 M.

4 0

3 years ago

Write an ionic equation for the reaction of acetic acid with sodium ethoxide, and specify whether the equilibrium favors startin

Elina [12.6K]

<h2>Acetic Acid + Sodium ethoxide ⇄ Butyric Acid + Sodium Hydroxide</h2>

Explanation:

An ionic equation for the reaction of acetic acid with sodium ethoxide is as follows -

Reactants -

Acetic Acid and Sodium ethanolate (sodium ethoxide)

Products -

Butyric Acid and Sodium hydroxide

Hence,

Acetic Acid + Sodium ethoxide ⇄ Butyric Acid + Sodium Hydroxide

$CH_3COOH + C_2H_5ONa$ ⇄ $CH_3COOC_2H_5 + NaOH$

Weak acids and bases have low energy than strong acids and bases.

The chemical equilibria shift the reaction side with the species having lower energy.

Given reaction is an acid-base reaction in which the equilibrium favors the starting material that means it will go to the side of the weakest acid that is acetic acid is weaker than butyric acid.

6 0

3 years ago

Help plisssssssssss I need helppp

Makovka662 [10]

Answer:

Explanation:

you would have to look more around the page, for example look at some ways that you can right down.

6 0

2 years ago

What do acids feel like

djverab [1.8K]

Answer:

In fact, some strong bases can burn the skin as badly as strong acids. Bases feel soapy or slippery because they react with acidic molecules in your skin called fatty acids. ... Like acids, bases change the colors of acid-base indicators, but the colors they produce are different. Bases turn litmus paper blue.

3 0

3 years ago