All categories

2 years ago

What is the density of an object whose mass is 142.5 g and whose volume is 7.5 mL?

Chemistry

2 answers:

rosijanka [135]2 years ago

8 0

D=19 mL hope this helps

guajiro [1.7K]2 years ago

6 0

Answer:

19g/mL

Explanation:

D=m/v

D=142.5/7.5

D=19 g/mL

You might be interested in

What is a nuetron activation analysis

Daniel [21]

Its a nuclear process used for determining the concentrations of elements in a cast amount of materials.

8 0

3 years ago

The total mass of the atmosphere is about 5.00 x 1018 kg. How many moles each of air, O2, and CO2 are present in the atmosphere?

n200080 [17]

Answer: The moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of atmosphere = $5.00\times 10^{18}kg=5.00\times 10^{21}g$

Average molar mass of atmosphere = 28.96 g/mol

Putting values in above equation, we get:

$\text{Moles of atmosphere}=\frac{5.00\times 10^{21}g}{28.96g/mol}=1.73\times 10^{20}mol$

We know that:

Percent of oxygen in air = 21 %

Percent of carbon dioxide in air = 0.0415 %

Moles of oxygen in air = $\frac{21}{100}\times 1.73\times 10^{20}=3.63\times 10^{19}mol$

Moles of carbon dioxide in air = $\frac{0.0415}{100}\times 1.73\times 10^{20}=7.18\times 10^{16}mol$

Hence, the moles of oxygen and carbon dioxide in air is $3.63\times 10^{19}mol$ and $7.18\times 10^{16}mol$ respectively

6 0

2 years ago

Which of the following reactions would you find in a radioisotope thermal generator

slavikrds [6]

The answer to your question is option 1. I hope this has helped.

3 0

2 years ago

Read 2 more answers

Choose all options that apply . Which of the following are steps necessary to ensure patient safety ? a) Make sure that the medi

Tems11 [23]

Answer:

c) Check to see if there's a better medication for the patient's problem.

d) Dispense an extra dose to save the patient from having to return in case of loss or damage to one of the doses.

e ) Compare the label on the medication with the order from the physician .

4 0

1 year ago

How is a mixture different from a compound?

kirza4 [7]

Explanation:

A mixture is made of two or more substances that are not chemically combined whereas a compound is made of 2 or more elements that are chemically combined. The elements that make up the compound are combined in fixed ratios.

3 0

2 years ago