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3 years ago

How many atoms of gold are in 54.5 grams?

Chemistry

1 answer:

grin007 [14]3 years ago

8 0

Answer:

1.67x10^23 atoms

Explanation:

From Avogadro's hypothesis, 1mole of any substance contains 6.02x10^23 atoms.

This means that 1mole of gold contains 6.02x10^23 atoms.

1 mole of gold = 197g

197g of gold contains 6.02x10^23 atoms.

Therefore, 54.5g of gold will contain = (54.5 x 6.02x10^23) /197 = 1.67x10^23 atoms

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Convert to moles:<br> 100.0g Ca3(PO4)2

salantis [7]

Answer:

0.322 moles

Explanation:

Given Mass, m = 100 g

The molar mass of Ca₃(PO₄)₂

Ca₃(PO₄)₂ = (3 x 40.08) + (2 x 30.97) + (8 x 16.00)

M = 310.18 g/mol

Let there are n number of moles,

n = given mass/ molar mass

$n=\dfrac{100 }{310.18 }\\\\n=0.322\ mol$

So, there are 0.322 moles.

6 0

3 years ago

What is the charge of an aluminum ion? (2 points) Select one: a. 2+ b. 3+ c. 2- d. 3-

choli [55]

Answer:- b. +3

Explanations:- Charge of a metal ion is equal to the number of valence electrons it has as it loses these electrons to have its nearest noble gas like electron configuration.

Al has 3 valence electrons and being a metal it loses all of these and so the charge of Al ion is +3. It could be shown as:

$Al\rightarrow Al^+^3+3e^-$

So, the right choice is b. 3+.

6 0

3 years ago

Where was all the hydrogen in the universe formed?

Maslowich

The low-mass elements, hydrogen and helium, were produced in the hot, dense conditions of the birth of the universe itself. The birth, life, and death of a star is described in terms of nuclear reactions. The chemical elements that make up the matter we observe throughout the universe were created in these reactions.

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3 years ago

What is the total number of atoms in the molecule HNO3?

melomori [17]

Answer:

We know that, composition of HNO3 is Hydrogen, Nitrogen and oxygen. Total number of atoms = 3+1+1=5 atoms are present in 1 molecule of HNO3.

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3 years ago

Na+H2O=NaOH+H2<br> Balancing

elena55 [62]

Answer:

Hey mate, here is your answer. Hope it helps you.

Explanation:

The balanced equation is 2Na+2H2O———-> 2NaOH +H2.

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3 years ago