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tatiyna
3 years ago
13

Lead has an action level of _______ micrograms per cubic meter.

Chemistry
1 answer:
ivanzaharov [21]3 years ago
6 0

Answer:

30

Explanation:

Action level is the level of exposure of an employee, not regard the use or wearing of respirators, to lead concentration of about 30 micrograms per cubic meter of air (30 µg/m3) which is calculated as per an 8-hour time-weighted average (TWA).

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2 NH3+ 2 O2 —> 2 NO+ 3 H2O
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Please help serious answers only
Darya [45]

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3 0
3 years ago
Calculate the energy required to heat 566.0mg of graphite from 5.2°C to 23.2°C. Assume the specific heat capacity of graphite un
maw [93]

Answer:

7.23 J

Explanation:

Step 1: Given data

  • Mass of graphite (m): 566.0 mg
  • Initial temperature: 5.2 °C
  • Final temperature: 23.2 °C
  • Specific heat capacity of graphite (c): 0.710J·g⁻¹K⁻¹

Step 2: Calculate the energy required (Q)

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6 0
3 years ago
Use the observation in the first column
Lyrx [107]

Answer:

A. Substance E

A. Substance C

A. Substance A  

Explanation:

Given that:

At 4 °C, Substance E has a vapor pressure of 86. torr and Substance F has a vapor pressure of 136. torr

Which has a higher boiling point?

A. Substance E

B. Substance F

C. Neither,EandF have the same boiling point

The vapor pressure varies inversely proportional to the boiling point.

\mathbf{vapor \ pressure \ \ \alpha \  \  \dfrac{1}{boiling \ point}}

Therefore, the lower the vapor pressure, the higher the boiling point.

At 4°C, Substance E with a lower vapor pressure of 86. torr will have a higher boiling point from the given information.

2.

Recall that :

\mathbf{vapor \ pressure  \ \  \alpha  \ \  \dfrac{1}{enthalpy \ of  \  vaporization}}

therefore, the lower the enthalpy of vaporization, the higher the vapor pressure at any given temperature.

Given that:

Substance C has an enthalpy of vaporization smaller than that of substance D. Then, substance C has a higher vapor pressure.

3.

We've earlier said that:

The vapor pressure varies inversely proportional to the boiling point.

\mathbf{vapor \ pressure \ \ \alpha \  \  \dfrac{1}{boiling \ point}}

Therefore, the lower the vapor pressure, the higher the boiling point.

As such, Substance A will have a higher boiling point.

6 0
3 years ago
Question 3
Fofino [41]
80% carbon and 20.% is hydrogen
5 0
3 years ago
Read 2 more answers
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