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aleksley [76]
3 years ago
7

How many moles are in 5.6 grams of Na?

Chemistry
2 answers:
a_sh-v [17]3 years ago
7 0
There are 0.244 moles in 5.6 grams of Na

Lubov Fominskaja [6]3 years ago
4 0

Explanation:

n=m/M

M(Na)=23

m(Na)=5.6

n=5.6/23

n=0.243moles

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Oxygen-17 and oxygen-18 _____. have the same mass are isotopes of oxygen have different numbers of protons
NNADVOKAT [17]

 oxygen -17   and  oxygen-18 are  isotopes  of  oxygen


<em><u>Explanation</u></em>

Isotope is two or more forms   of the same element  that  has  equal  amount of proton but different  number of neutrons  in the nuclei.

oxygen -17 and oxygen-18  are  isotope    of oxygen since they  have the equal amount   of  protons but different   number of  neutrons  in their  nuclei.

that  is oxygen  17  has   8  protons  and  9  neutrons  while  oxygen 18  has  8 protons and  10  neutrons.


8 0
3 years ago
What is the number of moles in 15.0 g AsH3?
pentagon [3]

We are given with the mass of Arsine (AsH_{3}

The mass of arsine is 15g

there is a relation between moles, mass and molar mass of any compound which is

moles=\frac{mass}{molarmass}

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the molar mass of Arsine = 74.92 + 3X 1 = 77.92 g/mol

Let us calculate the moles as

moles=\frac{15}{77.92}=0.192mol


7 0
3 years ago
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nata0808 [166]

Answer:

A table was attached to the question

Explanation:

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astra-53 [7]

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