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melamori03 [73]
3 years ago
9

All please guys help me please ​

Chemistry
1 answer:
MA_775_DIABLO [31]3 years ago
7 0

Explanation:

<em>Percentage </em><em>composition </em><em>by </em><em>mass</em>

  1. <em>2</em><em>1</em><em>.</em><em>2</em><em> </em><em>%</em>
  2. <em>4</em><em>6</em><em>.</em><em>6</em><em>%</em>
  3. <em>3</em><em>5</em><em>%</em>
  4. <em>2</em><em>1</em><em>.</em><em>2</em><em> </em><em>%</em>
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A neutron walks into a gas station to buy some snacks. He ask the cashier ,"How much"? The cashier replies,"For you? No charge."
alexandr1967 [171]
Neutrons are neutral, so they don’t have a positive or negative charge. Hence, the cashier says no charge for the neutron. It is quite funny when you think about it lol.
5 0
4 years ago
Someone please help! this is the last question<br>I only need help with B.<br><br>​
ludmilkaskok [199]

1. mol ratio of Al(NO₃)₃ : Na₂CO₃ = 2 : 3

2. Na₂CO₃ as a limiting reactant

<h3>Further explanation</h3>

Given

Reaction

2 Al(NO₃)₃ + 3 Na₂CO₃ → Al₂(CO₃)₃ + 6 NaNO₃

Required

mol ratio

Limiting reactant

Solution

The reaction coefficient in the chemical equation shows the mole ratio of the components of the compound involved in the reaction (reactants and products)

1. From the equation mol ratio of Al(NO₃)₃ : Na₂CO₃ = 2 : 3

2. mol : coefficient of Al(NO₃)₃ : Na₂CO₃ = 2 mole/2 : 2 mole/3 = 1 : 0.67

Na₂CO₃ as a limiting reactant (smaller)

6 0
3 years ago
Write an equation for the reaction of the Tollens reagent<br> withheptanal?
dangina [55]

Answer:

CH_3 CH_2 CH_2 CH_2 CH_2 CH_2 CHO + 2[Ag(NH_3)_2]+  3 H_2 O = CH_3 CH_2 CH_2 CH_2 CH_2 CH_2 COOH +2Ag + 4NH_3

Explanation:

Tollens test is carried out to perceive difference between aldehydes and ketones on the basis of their capability to oxidized easily.

when Tollens react with aldehyde (heptanal) , a silver mirror is form on inner side of container.

The reaction between tollens and heptanal is given as

CH_3 CH_2 CH_2 CH_2 CH_2 CH_2 CHO + 2[Ag(NH_3)_2]+ 3 H_2 O = CH_3 CH_2 CH_2 CH_2 CH_2 CH_2 COOH +2Ag + 4NH_3

8 0
4 years ago
What is calcium's matching element
vodomira [7]

Answer: Explanation:

Calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in Earth's crust.

...

Calcium.

atomic number 20

oxidation state +2

electron configuration 1s22s22p63s23p64s2

Explanation:

8 0
3 years ago
Given that the molar mass of NaNO3 is 85.00 g/mol, what mass of NaNO3 is needed to make 4.50 L of a 1.50 M NaNO3 solution? Use m
Virty [35]

<u>Ans: Mass of NaNO3 = 574 g</u>

<u>Given:</u>

Volume of NaNO3, V = 4.50 L

Molarity of NaNO3, M = 1.50 M i.e. 1.50 moles/L

Molar mass of NaNO3 = 85.00 g/mol

<u>To determine:</u>

The mass of NaNO3

<u>Explanation:</u>

Molarity of a solution can be expressed as the number of moles of the solute in a liter volume of solution

Molarity  of NaNO3 = moles of NaNO3/volume of solution in L

1.50 moles/L = moles/4.50 L

moles NaNO3 = 1.50 *4.50 = 6.75 moles

Now, moles of NaNO3 = mass of NaNO3/molar mass NaNO3

mass of NaNO3 = moles * molar mass =

                          = 6.75 moles * 85.00 g/mole

                          = 573.75 g = 574 g      

8 0
3 years ago
Read 2 more answers
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