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bixtya [17]
2 years ago
15

What is the atomic number and the mass number of an atom with 11 protons and 12 neutrons?

Chemistry
1 answer:
sleet_krkn [62]2 years ago
8 0

Answer:

e

Explanation:

e

e

e

e

ee

e

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Margaret [11]

Answer:

Density is 2.7 grams

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formula for density is p= mass over volume [p being density]. So all you have to do is divide

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A closed container is filled with oxygen. the pressure in the container is 275 kpa . what is the pressure in millimeters of merc
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1 kpa = 7.5 mm of Hg  [Remember it or can be found on internet ]

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Explanation:

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3 years ago
Read 2 more answers
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kifflom [539]

Explanation:

a. Magnesium oxide is used mainly in soil treatment and groundwater remediation, wastewater treatment, etc. it is used for it's acid buffering capacity and effectiveness in dissolving heavy metals.

b. MgO is the chemical equation for the reaction.

c. multiply the given mass of O2 by the inverse of it's molar mass. multiply the molar ratio (from the balanced equation) between O2 and MgO. Multiply by the molar mass of MgO. 32g O2 x 1 mol O2 ... 32g O2 x 2mol MgO 1mol O2 x 40g MgO. .... 1mol MgO = 80 g.

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3 years ago
Green plants absorb sunlight to power photosynthesis, the chemical synthesis of food from water and carbon dioxide. The compound
aleksandr82 [10.1K]

Answer:

f=4.67x10^{14}Hz

Explanation:

Hello,

The frequency and wavelength of electromagnetic waves propagating in free space might be related to each other by using the following equation:

c=λf

Solving for the frequency:

f=c/λ

Knowing that λ stands for the wavelength (642 nm for the mentioned incident light), c the light velocity (300.000 m/s) and f the frequency, we get the asked frequency as:

f=\frac{3x10^6m/s}{642x10^{-9}m} =4.67x10^{14}Hz}

Best regards.

4 0
3 years ago
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