CHEMISTRY HIGH SCHOOL

For the reaction 2HNO3 + Mg(OH)2 -> Mg(NO3)2 + 2H20 How many grams of magnesium nitrate are produced from 5.5 moles of nitric acid (HNO3)?

Answers

Answer 1
Answer:

The amount of magnesium nitrate are formed from the 5.5 moles of the nitric acid in grams are 407.8 g.

The reaction is as :

2HNO₃  +   Mg(OH)₂  ---->  Mg(NO₃)₂  +  2H₂O

The number of moles of nitric acid = 5.5 moles

2 moles of the nitric acid = 1 mole of the magnesium nitrate

The number of moles of nitric acid = 5.5 / 2 mol

The number of moles of nitric acid = 2.75 mol

The grams of the magnesium nitrate = moles × molar mass

The grams of the magnesium nitrate = 2.75 mol × 148.3 g/mol

The grams of the magnesium nitrate = 407.8 g

Therefore, the mass of the magnesium nitrate is 407.8 g.

To learn more about moles here

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Answer 2
Answer: Ok, so i thought it through, and the answer is 815.7314 grams :) 
happy to show my working out if you want/ need :)

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What is the main product of the calvin cycle?

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glucose
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Boron occurs naturally as two isotopes. What is the difference between these isotopes?

Answers

Answer: The two isotopes of boron differs in mass number rather than atomic number.

Explanation:

Isotopes are defined as the chemical species that have same atomic number but differ in their mass number.

Boron is the 5th element of the periodic table and have 2 naturally occurring isotopes. The isotopes are : B-10 and B-11

For _5^(10)\textrm{B} isotope:

Percentage abundance of this isotope = 20 %

Atomic number = 5

Mass number = 10

For _5^(11)\textrm{B} isotope:

Percentage abundance of this isotope = 80 %

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Mass number = 11

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In the formula X2O5, the symbol X could represent an element in Group(1) 1 (3) 15
(2) 2 (4) 18

Answers

Answer: (3) 15

Explanation: We criss-cross down the oxidation numbers to get the subscripts for the correct formulas. That means the X has an oxidation number of 5. The element with the + oxidation number is always written first so it is +5. Of the groups names, only group 15 has +5 as an oxidation number.

A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of a 2.18 g sample burns in excess oxygen yields 3.94 g of CO2 and 1.89 g of H2O. A separate experiment shows that a 1.23 g sample contains 0.235 g of N. Calculate the moles of C in the sample.1. Calculate the moles of N for a 2.18 g sample (the sample size for the other analyses).
2. Calculate the moles of O in the sample.

Answers

Answer:

The answers are

C = 0.0895 moles

1. 0.02975 moles of N

2. 0.0299 moles O

Explanation:

Mass of sample = 2.18 g

Combustion yields 3.94 g of CO₂ and 1.89 g of H₂O

1.23 g of sample contains 0.235 g of N

3.94 g of CO₂ which contains one mole of C and two moles of O

Molar mass of CO₂ = 44 mass fraction of C = 12/44 = 0.273, Therefore mass of  carbon in 2.18 g = 0.273×3.94 = 1.075 g

number of moles of C in sample = mass/(molar mass) = 1.075 g/(12.01 g/mol) = 0.0895 moles of C

(1) Mass of nitrogen, in 1.23 g of sample = 0.235

therefore mass in 2.18 g =0.235×2.18/1.23 = 0.4165 g

= 0.02975 moles of N

(2) To find the number of moles of oxygen in the sample we note that total mass of sample  = 2.18 g containing only nitrogen, hydrogen, oxygen and carbon

Mass of hydrogen can be fround from 2/18×1.89 = 0.21 g

Mass of oxygen therefore = 2.18 -(0.21+0.4165+1.075) = 0.4785  

number of moles = 0.475/16 = 0.0299 moles

What is the difference in the beginning between primary succession and secondary succession?a. secondary succession has water
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Answers

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A substance is tested in a lab. It is found to maintain a unique shape and is a good conductor of electricity. If it is made up of electrons, protons, and neutrons, what state of matter is this substance most likely to be?

Answers

Answer : Solid

Explanation :

When the substance was tested in the lab it was seen that it maintains a unique shape, which is the differentiating property of solids. Also, they are very good conductors of electricity. Solid contains electrons, protons and neutrons this is a common thing which is found in every state of matter. This all details confirms that it will be solid.
if its made up of electrons, protons, and neurons, the state of matter in this substance is most likely to be : Solid

we know that the substance
- a good conductor (and most of good conductors are metals and almost all the metals are solid)
- Could maintain a unique shape (gas technically does not have a shape and liquid's shape will be determined by the medium surrounding it)
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