All categories

3 years ago

A scalpel made of surgical stainless steel is sterilized by heating in a flame and then quenching in 175 g of ethyl alcohol. The

Chemistry

1 answer:

Musya8 [376]3 years ago

4 0

Answer:

-6300J

Explanation:

The quantity of heat required to raise the temperature of a substance per unit of mass could be written as:

Q = -m×C×ΔT

Where Q is heat, m is mass of substance, C is specific capacity and ΔT is change in temperature.

Replacing:

Q = -175g × 2.4J/gK × (38.6°C-23.7°C)

Q = -6258J ≡ -6300J

You might be interested in

Which of the following feedbacks can be either positive or negative?

miv72 [106K]

Answer:

Cloud cover feedback

Explanation:

6 0

2 years ago

Which of these is true about a pH meter?

Goryan [66]

The pH meter measure the concentration of the hydrogen(+) ion, and the concentration of Hydroxide(-). Hydrogen is acidic, Hydroxide is basic.

The answer is D.

7 0

2 years ago

Read 2 more answers

A vessel contains a mixture of gases. The mass of each gas used to make the mixture is known. Which of the following information

faltersainse [42]

Answer: The molar mass of each gas

Explanation:

Mole fraction is the ratio of moles of that component to the total moles of solution. Moles of solute is the ratio of given mass to the molar mass.

$\text{Mole fraction of solute}=\frac{\text{Moles of solute}}{\text{Total Moles}}$

Suppose if there are three gases A, B and C.

a) $\text{Mole fraction of A}=\frac{\text{Moles of A}}{\text{ Moles of (A+B+C)}}$

b) $\text{Mole fraction of B}=\frac{\text{Moles of B}}{\text{ Moles of (A+B+C)}}$

c) $\text{Mole fraction of C}=\frac{\text{Moles of C}}{\text{ Moles of (A+B+C)}}$

moles of solute = $\frac{\text {given mass}}{\text {Molar mass}}$

Thus if mass of each gas is known , we must know the molar mass of each gas to know the moles of each gas.

8 0

2 years ago

Rank the following in terms of increasing ionization energy: Sulfur, oxygen, hydrogen, and fluorine.

Naily [24]

Answer:

Ranked from lowest to highest:

Sulfur - 999.6 kJ/mol

Hydrogen - 13.5984 kJ/mol

Oxygen - 13.6181 kJ/mol

Fluorine - 17.4228 kJ/mol

3 0

2 years ago

An atom Q contains 19 electrons, 19 protons and 20 neutrons. What is Q

ZanzabumX [31]

Answer: Potassium

Explanation: Potassium is the chemical element with 19 electrons, 19 protons and 20 neutrons.

Please mark me Brainliest if you think that had answer this question in a better way.

Thank you,

3 0

3 years ago

Read 2 more answers