Answer:
<h3>The answer is 1.04 g/mL</h3>
Explanation:
The density of a substance can be found by using the formula
From the question
mass of coke = 21.36 g
volume = 20.5 mL
So we have
We have the final answer as
<h3>1.04 g/mL</h3>
Hope this helps you
Answer:
33 degress celcuis would be the answer because you have to divide all the numbers
Explanation:
1 mole of any substance is: 6.022*10²³ atoms or molecules.
9 moles of H₂S=9(6.022*10²³ molecules)=5.4198*10²⁴ molecules.
answer:there are 5.4198*10²⁴ molecules in 9.00 moles of H₂S.
(a) The nucleus has most of the mass and comprises most of the volume of an atom; false
The nucleus has most of the mass but the volume of an atom is depends on the distance between the nucleus and the position of the electrons.
(b) Every atom of a given element has the same number of protons; true
They may have different number of neutrons and so you have isotopes but the number of protons remain the same for a given element.
(c) The number of electrons in an atom equals the number of neutrons in the atom; false
The number of electrons in an atom equals the number of protons in the atom.
The electrons are negatively charged which compensate the positively charged protons not the neutrons which do not have a charge (they are neutral).
(d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force. true
Answer:
2.72g
Explanation:
The balanced equation of this reaction is given as follows:
Na2O + H20 --> 2NaOH
Based on this balanced equation, 1 mole of Na2O will produce 2 moles of NaOH.
First, we need to convert mass of Na2O into moles by using the formula;
mole = mass/molar mass
Molar mass of Na2O = 23(2) + 16
= 46 + 16
= 62g/mol
mole = 2.1g/62g/mol
mole of Na2O = 0.034mol
Hence, if 1 mole of Na2O will produce 2 moles of NaOH.
Then, 0.034mol of Na2O will produce (0.034 × 2) = 0.068mol of NaOH.
To convert mole of NaOH to mass, we use;
mole = mass/molar mass
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
0.068 = mass/40
mass of NaOH produced = 2.72g.