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3 years ago

How do i find the atomic mass and number ?

1 answer:

3 0

To get the atomic mass you need to combine the neutrons and protons together, and the atomic number is the number of protons in an atom!

Hope this helps if not comment below please!!!

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Equal amounts of four gases are placed in identical containers at the temperatures that are noted below. Samples of Gases at Dif

Alborosie

Answer : S) 33.2 °C

Explanation : When the equal amounts of gases are placed in identical containers but subjected to different temperatures would exert pressure in different amount which will in turn increase the rate of collision between the molecules of gas.

So, when the temperature is increased to maximum greater amount of force would be exerted and the gas molecules will collide with a larger force. Hence the answer will be as the highest temperature i.e. 33.2 °C

4 0

3 years ago

Using the balanced chemical reaction below, how many grams of copper (cu) metal can be obtained from 1.00 kg of copper ore (cu3f

aleksklad [387]

Answer : Mass of copper (Cu) metal obtained = 556.281 g

Solution : Given,

Mass of copper ore = 1 Kg = 1000 g

From the periodic table, the molar mass of copper and copper ore are

Molar mass of copper = 63.546 g/mole

Molar mass of copper ore, $Cu_{3}FeS_{3}$ = 342.678 g/mole

First we have to calculate the number of moles of copper ore, $Cu_{3}FeS_{3}$

Moles of $Cu_{3}FeS_{3}$ = $\frac{\text{ Mass of copper ore}}{\text{ Molar mass of copper ore}}$ = $\frac{1000g}{342.678g/mole}$ = 2.918 moles

The balanced chemical reaction is :

$2Cu_{3} FeS_{3}(s)+7O_{2}(g)\rightarrow 6Cu(s)+2FeO(s)+6SO_{2}(g)$

From this chemical reaction, we conclude that

2 moles of $Cu_{3}FeS_{3}$ gives → 6 moles of Cu

2.918 moles of $Cu_{3}FeS_{3}$ gives → $\frac{6moles}{2moles}\times 2.918moles$

= 8.754 moles

Thus, the Moles of copper (Cu) = 8.754 moles

Now, calculate the Mass of copper (Cu).

Mass of copper (Cu) = Moles of copper (Cu) × Molar mass of copper (Cu)

= 8.757 moles × 63.546 g/moles

= 556.281 g

4 0

3 years ago

Read 2 more answers

Fe + O2 --> FeO (unbalanced). How many mLs of O2 are needed to react with 18.0 g of Fe ? *

worty [1.4K]

0.161 mols.

Balance the equation first

2Fe + O2 •••••> 2FeO

Find the molar masses of the compound

2(56) + 2(16) •••••> 2(56+16)

112g + 32g •••••> 144g

Fe reacting with O2

112g of Fe reacting with 32g of O2

18g of Fe reacting with x

x= 32×18/112

x= 5.143g

Amount= mass/ molar mass

Amount= 5.143g/32g

Amount= 0.161mls

4 0

3 years ago

Describe three ways that individuals can combat global warming.

vagabundo [1.1K]

They could stop driving cars and opt in for walking or riding a bike, drive an electric car because they don't take gas. They could also get their electricity from renewable resources such as electricity from wind mills and solar panels and hydro-electric.

8 0

3 years ago

Which statement best describes an example of selective breeding?

Gennadij [26K]

Answer:

Answer is <u>A</u>

Explanation:

this is because selective breeding means selecting plants or animals having desired characteristics and let them breed with each other to reproduce an offspring having desired characteristics from both parents.

3 0

3 years ago

Read 2 more answers