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4 years ago

Which measurement has the greatest number of significant figures?

Chemistry

1 answer:

soldi70 [24.7K]4 years ago

3 0

Answer:

Option B = 60,600 mg (correct option)

Explanation:

First of all we will have an idea which numbers are consider as significant.

1 = All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

2= Leading zeros are not consider as a significant figures. e.g. 0.02 in this number only one significant figure present which is 2.

3= Zero between the non zero digits are consider significant like 105 consist of three significant figures.

4= The zeros at the right side e.g 3400 are also significant. There are four significant figures are present.

In given options, Option A 60.6 mg have 3 significant figures.

Option B have 5 significant figures.

Option C have 4 significant figures.

Option D have 3 significant figures.

Thus option b is correct option which have more significant figures.

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n acid with a pKa of 8.0 is present in a solution with a pH of 6.0. What is the ratio of the protonated to the deprotonated form

Nady [450]

Answer : The ratio of the protonated to the deprotonated form of the acid is, 100

Explanation : Given,

$pK_a=8.0$

pH = 6.0

To calculate the ratio of the protonated to the deprotonated form of the acid we are using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[Deprotonated]}{[Protonated]}$

Now put all the given values in this expression, we get:

$6.0=8.0+\log \frac{[Deprotonated]}{[Protonated]}$

$\frac{[Deprotonated]}{[Protonated]}=0.01$

As per question, the ratio of the protonated to the deprotonated form of the acid will be:

$\frac{[Protonated]}{[Deprotonated]}=100$

Therefore, the ratio of the protonated to the deprotonated form of the acid is, 100

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3 years ago

Balance the following chemical equation by providing the correct coefficients HBr+Ba(OH)2 ———— BaBr2+H2O

stealth61 [152]

Answer:

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3 years ago

In which of the following substances does sharing of electrons between two atoms occur?

sammy [17]

Answer:

PO4∧-3

Explanation:

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While He is present in mono atomic form

NaI have ionic bond which is formed by donating electrons from one atom and other accept.

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4 years ago

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3350 J of heat is required to raise the temperature of a sample of AlF3 from 250C to 800C. What is the mass of the sample?

Aleonysh [2.5K]

Answer:

Look up the specific heat capacity of AlF₃
Calculate ΔT
Calculate the mass of AlF₃

Explanation:

The formula for for the heat (q) absorbed by an object is

q = mCΔT, where

m = the mass of the sample

C = the specific heat capacity of the sample. and

ΔT = the change in temperature

1. What you must do

Look up the specific heat capacity of AlF₃
Calculate ΔT
Calculate the mass of AlF₃

2. Sample calculation

For this example, I assume that the specific heat capacity of AlF₃ is 1.16 J·K⁻¹mol⁻¹ .

(a) Calculate ΔT

$\Delta T = T_{\text{f}} - T_{\text{i}} = 800 \, ^{\circ}\text{C} -250 \, ^{\circ}\text{C} = 550 \, ^{\circ}\text{C}$

(b) Calculate m

$\begin{array}{rcl}\text{3350 J} & = & m \times 1.16 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}\times \text{550 K}\\3350 & = & m \times \text{638 g}^{-1}\\m & = &\dfrac{3350}{\text{638 g}^{-1}}\\\\ & = & \text{ 5.2 g}\\\end{array}\\$

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zysi [14]

Answer:

Explanation:

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3 years ago

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