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erik [133]
2 years ago
7

Find the mass (in g) of 1.00 atom of lead.

Chemistry
1 answer:
Mice21 [21]2 years ago
6 0

Answer:

207g

Explanation:

207.2 to be more specific

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What is the mass of solid NH4Cl formed when 75.5g of NH3 is mixed with an equal mass of HCl? What is the volume of the gas remai
taurus [48]

Answer:The volume of the remaining gas that is ammonia is 23.85 L.

Explanation:

NH_3(g)+HCl(g)\rightarrow NH_4Cl(s)

Moles of NH_3=\frac{\text{mass of} NH_3}{\text{Molar mass of}NH_3}=\frac{75.5 g}{17.03 g/mol}=4.43 mole

Moles of HCl of gas = \frac{\text{mass of} HCl}{\text{Molar mass of}HCl}=\frac{75.5 g}{36.5 g/mol}=2.06 mol

According to reaction 1 mole of HCl reacts with 1 mol of NH_3 then 2.06 moles of HCl will react with = 2.06 moles of NH_3

Moles left of ammonia left = 4.43 - 2.06 = 2.36 moles

Volume of the gas will be given by Ideal gas equation: PV=nRT

Pressure = 752 mmHg = 752 × 0.0031 atm = 2.33 atm

R = 0.08026 L atm/K mol

V = ? , n = number of moles of ammonia

Temperature = 14 °C = 14 + 273 K = 287 K(0°C = 273K)

V=\frac{2.36 mol\times 0.08206 L atm/K mol\times 287 K}{2.33 atm}=23.85 L

The volume of the remaining gas that is ammonia is 23.85 L.

8 0
2 years ago
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I need to balance an equation
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I inserted a picture to show u how I worked it out

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Listed below are the amounts of mercury​ (in parts per​ million, or​ ppm) found in tuna sushi sampled at different stores. The s
LenaWriter [7]

Answer:

• <em>The 90%  inverval estimate of the mean amount of mercury in the population is </em><u>[0.420 ppm, 1.252 ppm]</u>.

Explanation:

<u>1) Data:</u>

• μ = 0.836 ppm

• σ = 0.253 ppm

• z = ?

• 90% confidence interval estimate of the mean = ?

<u />

<u>2)  Finding Zo for Pr = 90%</u>

The symmetry of the standard normal distribution implies that, for the 90% confidence interval, 5% of the values (area) are above Zo and 5% are below = - Zo.

Using <em>technology</em> (statistic software) or a <em>table</em> of the standard normal probability, you find that for Pr ≥ 0.05 means Zo   ≥ 1.6045.

And, by symmetry, Pr ≤ 0.05 means Zo ≤ -1.6045.

<u>3) Calculate the limits of the interval:</u>

<u />

• Formula:  z = ( X - μ) / σ

• Upper limit:  X = zσ + μ = 1.645 (0.253 ppm) + 0.836 ppm = 1.252 ppm.

• Lower limit: X = zσ + μ = -1.645 (0.253ppm) + 0.836 =  0.420 ppm.

Then, the 90%  inverval estimate of the mean amount of mercury in the population is [0.420 ppm, 1.252 ppm] ← answer

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3 years ago
Explain how the crystals of an igneous rock are used to help classify it. PLEASSSEEEE HELP ME
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Answer:

Explain how the crystals of an igneous rock are used to help classify it. PLEASSSEEEE HELP ME

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Write and balance the following equation:
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Answer:

The answer is 2Al + Pb(NO3)2 ->2AlNO3 + Pb.

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Al represents <em>A</em><em>l</em><em>u</em><em>m</em><em>i</em><em>n</em><em>i</em><em>u</em><em>m</em><em> </em><em>.</em>

Pb(II) represents <em>L</em><em>e</em><em>a</em><em>d</em><em> </em><em>(</em><em>I</em><em>l</em><em>)</em><em> </em><em>i</em><em>o</em><em>n</em><em>s</em><em> </em><em>.</em>

NO3 represents<em> </em><em>N</em><em>i</em><em>t</em><em>r</em><em>a</em><em>t</em><em>e</em><em>s</em><em> </em><em>i</em><em>o</em><em>n</em><em>s</em><em> </em><em>.</em>

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