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2 years ago

I really need help please someone help me?!. Those are all the questions.

Chemistry

2 answers:

natima [27]2 years ago

4 0

Answer:

question two is most likely you can describe the shape as a twisted ladder, thats what I learned in school.

Explanation:

ch4aika [34]2 years ago

4 0

Sorry I couldn’t help

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What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%

Step2247 [10]

Answer:

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

Mass Cu:

7.3g * 86% = 6.278g is the mass of Cu.

Moles Cu:

6.278g * (1mol / 63.546g) = 0.099moles Cu

Atoms Cu:

0.099moles Cu * (6.022x10²³atoms / 1mol) =

<h3>5.9x10²² atoms of Cu are in one naira coin</h3>

4 0

2 years ago

Final setup in scientific method

Mrrafil [7]

Answer:

The final step is to REPORT!!!

3 0

3 years ago

in the two stage cooling method what is the maximum amount of time allowed for both stages cooling food from 135 to 41 degrees F

BlackZzzverrR [31]

In the past, restaurants had four hours, straight through, to cool food to 41°F or lower. Now the FDA recommends cooling food in two stages -- from 135°F to 70°F in two hours then from 70°F to 41°F or lower in an additional four hours for a total cooling time of six hours
Explanation:
the two-stage cooling method is a Food Code counselled procedure for cooling food in restaurants and foodservice institutions. within the two-stage cooling methodology, food is cooled from 140° F (60° C) to 70° F (21° C) among 2 hours and to 41° F (5° C) or lower among four hours. Use of this cooling methodology ensures that food is cooled quickly and safely and has no harmful effects.

3 0

3 years ago

Read 2 more answers

8,000 meters into miles (show work)

pickupchik [31]

Answer:

8000 metres is equal to 4.971 miles

equation

8000 (number of meters) divided by 1609.34 ( equivalent of miles in one meter)

is equal to 4.971

7 0

3 years ago

Read 2 more answers

5.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 7

slega [8]

Answer:

The molecular formula = C6H6

Explanation:

Step 1: Data given

Mass of compound X = 5.00 grams

Mass of products =

CO2 = 16.39 grams

H2O = 3.46 grams

Molar mass CO2 = 44.01 g/mol

Molar mass H2O = 18.02 g/mol

Molar mass C = 12.01 g/mol

Molar mass H = 1.01 g/mol

Molar mass O = 16. 0g/mol

Step 2: Calculate moles

Moles = mass / molar mass

Moles CO2 = 16.93 grams / 44.01 g/mol

Moles CO2 = 0.385 moles

Moles C = 1* 0.385 = 0.385 moles

Moles H2O = 3.46 grams / 18.02

Moles H2O = 0.192 moles

Moles H = 2* 0.192 = 0.384 moles

Step 3: Calculate mass

Mass = moles * molar mass

Mass C = 0.385 moles *12.0 g/mol

Mass C = 4.62 grams

Mass H = 0.39 grams

Mass O = 5.00 - 4.62 -0.38 moles

Mass O = 0 grams

Step 4: Calculate mol ratio

We divide by the smallest amount of moles

C: 0.385 moles / 0.384 = 1

H: 0.384 moles / 0.384 = 1

The empirical formula is CH

This molecular formula is 13 g/mol

We have to multiply the empirical formula by n

n = 78 g/mol / 13 g/mol

n = 6

The molecular formula = 6*(CH) = C6H6

4 0

3 years ago