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3 years ago

I need help with this for science

Chemistry

1 answer:

Fantom [35]3 years ago

6 0

Answer:

Structural

Explanation:

It is a structure that those organisms have that allow it to be better suited for a task or for that organism's environment.

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A. What is the mass of 3.47x10^26 molecules of CuCl2?

Dafna11 [192]

Answer:

77460 g

Explanation:

To solve this problem first we convert molecules into moles, using Avogadro's number:

3.47x10²⁶ molecules ÷ 6.023x10²³ molecules/mol = 576.12 moles

Then we convert 576.12 CuCl₂ moles into grams, using its molar mass:

576.12 mol * 134.45 g/mol = 77460 g

So the answer is 77460 g, or 77.46 kg.

7 0

3 years ago

What is the vapor pressure of the pure solvent if the vapor pressure of a solution of 10 g of sucrose (C6H12O6) in 100 g of etha

amid [387]

Answer:

56.4 mmHg

Explanation:

Given:

Vapor pressure of the solution, P solution = 55 mmHg

The mass of sucrose (C₆H₁₂O₆) = 10 g

Also, Molar mass of sucrose (C₆H₁₂O₆) = 180 g/mol

So, moles = Given mass/ molar mass

Hence, moles of sucrose in the solution = 10 g / 180 g/mol = 0.05556 mol

Given that: Mass of ethanol = 100 g

Molar mass of ethanol = 46 g/mol

Hence, moles of ethanol = 100 g / 46 g/mol = 2.174 mol

Mole fraction of solvent, ethanol is:

X ethanol = 2.174 mol / (2.174 + 0.05556) mol = 0.975

Applying Raoult's Law

P solution = X ethanol*P° ethanol

 => P° ethanol = P solution / X ethanol = 55 mmHg / 0.975 = 56.4 mm Hg

6 0

4 years ago

Read 2 more answers

Which statement is true about sodium hydroxide (NaOH)?

Leokris [45]

Answer: D. It is a base because it increases the concentration of hydroxide ions.

Explanation: A base is a substance which dissociates to give hydroxide ions in water.

An acid is a substance which dissociates to give hydrogen ions in water.

$NaOH\rightarrow Na^++OH^-$

So $NaOH$ is a base as it gives $OH^-$ ions when dissolved in water.

5 0

3 years ago

128.3 grams of methane (CH4) is equal to how many moles of methane

Neko [114]

About 8.0 moles of methane.Number of moles = MassMolar mass.

And thus we get the quotient:

128.3⋅g16.04⋅g⋅mol−1=8.0⋅moles of methane.

Note that the expression is dimensionally consistent, we wanted an answer in moles, and the quotients gives, 1mol−1=11mol=mol as required.

6 0

3 years ago

Read 2 more answers

Cual es la convención de 746 Hm

White raven [17]

Answer:

75.6

Explanation:

756x0.1=75.6

1 d =hm=0.1

5 0

2 years ago