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2 years ago

Which of these data points is the most reliable?

Chemistry

1 answer:

Sonja [21]2 years ago

5 0

Answer:

third point

Explanation:

omniscient because it gives info about every character instead of one

hope this helps

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The following shows the precipitation reaction of barium chloride (BaCl₂) and sodium hydroxide (NaOH):

Nadya [2.5K]

Answer:

The answer to your question is:

a) BaCl2

b) 0.8208 g

c) yield = 85.3 %

Explanation:

BaCl₂(aq) + NaOH(aq) ----> Ba(OH)₂(s) + 2NaCl(aq)

Data

a) 1 g of BaCl₂

1 g of NaOH

MW BaCl2 = 137 + (35.5x2) = 208 g

MW NaOH = 23 + 16 + 1 = 40 g

208 g of BaCl2 ------------- 1 mol

1 g of BaCl2 ------------- x

x = ( 1 x 1) / 208 = 0.0048 mol of BaCl2

40 g of NaOH ------------ 1 mol

1 g of NaOH ------------ x

x = (1 x 1) / 40

x = 0.025 mol of NaOH

The ratio BaCl2 to NaOH is 1:1 (in the equation)

But experimentally we have 0.0048 : 0.025, so the limiting reactant is BaCl2, because is in lower concentration.

1 mol of BaCl2 -------------- 1 mol of Ba(OH)2

0.0048 mol --------------- x

x = (0.0048 x 1) / 1

x = 0.0048 mol of Ba(OH)2

MW Ba(OH)2 = 137 + 32 + 2 = 171 g

171 g of Ba(OH)2 -------------------- 1 mol

x -------------------- 0.0048 mol

x = (0.0048 x 171) / 1

x = 0.8208 g

c)Data

Ba(OH)2 = 0.700 g

% yield = 0.700 / 0.8208 x 100

% yield = 85.3

Sorry, i don't understand this question

6 0

3 years ago

How many grams are in 6.53 moles of Pb

dezoksy [38]

Mr: 207.2
m=n×Mr= 6.53×207.2= 1353.02g

7 0

3 years ago

What does marine scientists do

soldier1979 [14.2K]

Answer:

They search and study plants and types of animals in the ocean.

5 0

3 years ago

Fluoride ion is poisonous in relatively low amounts: 0.2 g of F− per 70 kg of body weight can cause death. Nevertheless, in orde

Jobisdone [24]

Answer:

200 L per day

Explanation:

If there is 1 mg of F- per L of water, we can calculate the volume for 2 g like this:

1) Converse the toxic mass of fluoride to miligrams

1 g ------- 1000 mg

0.2 g ---- X

X = 200 mg

2) Calculate the liters of fluoridated drinking water that a person can consume to reach 200 mg

1 mg -------- 1 L

200 mg ---- X

x = 200 L

4 0

3 years ago

Read 2 more answers

Calcium carbide reacts with water to produce acetylene gas according to the following equation: CaC2(s) + 2H2O(l)C2H2(g) + Ca(OH

mars1129 [50]

Answer : The number of moles of $CaC_2$ reacted was, 0.214 moles.

Explanation :

First we have to calculate the mole of $C_2H_2$ gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $C_2H_2$ gas = 748 mmHg - 23.8 mHg = 724.2 mmHg = 0.953 atm (1 atm = 760 mmHg)

V = Volume of $C_2H_2$ gas = 5.50 L

n = number of moles $C_2H_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $C_2H_2$ gas = $25^oC=273+25=298K$

Putting values in above equation, we get:

$0.953atm\times 5.50L=n\times (0.0821L.atm/mol.K)\times 298K$

$n=0.214mol$

Now we have to calculate the moles of $CaC_2$

The balanced chemical reaction is:

$CaC_2(s)+2H_2O(l)\rightarrow C_2H_2(g)+Ca(OH)_2(aq)$

From the balanced chemical reaction we conclude that,

As, 1 mole of $C_2H_2$ gas produced from 1 mole of $CaC_2$

So, 0.214 mole of $C_2H_2$ gas produced from 0.214 mole of $CaC_2$

Therefore, the number of moles of $CaC_2$ reacted was, 0.214 moles.

4 0

3 years ago