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kogti [31]
2 years ago
8

How many electrons in an atom with the atomic number of 45

Chemistry
1 answer:
Sergio039 [100]2 years ago
4 0

Answer:

Number of Protons: 45

Number of Neutrons: 58

Number of Electrons: 45

Explanation:

Have a nice day

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What was the name for the secret code used by many alchemists?
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Answer:

A. Zodiac

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D. Decknamen

The correct answer is D. Decknamen.

Explanation:

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When determining the specific heat from a given metal in a calorimeter the mass of the water remains constant, but the mass of t
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If 40.0 g of HCl react with an excess of magnesium metal, what is the theoretical yield of hydrogen?
lyudmila [28]

The balanced reaction is:<span>

Mg (s) + 2HCl (aq) --> MgCl 2 (aq) + H 2 (g) 

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8 0
3 years ago
A piece of gold ingot with a mass of 301 g has a volume of 15.6 cm3 . calculate the density of gold.
Fantom [35]

Answer:

            19.29 g.cm⁻³

Solution:

Data Given:

                             Mass  =  301 g

                             Volume  =  15.6 cm³

Formula Used:

                             Density  =  Mass ÷ Volume

Putting values,

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6 0
2 years ago
1. Methane (CH4) combusts as shown in the equation below. If 3 moles of methane were used in the combustion, what would be the c
umka2103 [35]

Answer:

The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ

Explanation:

<u>Step 1: </u>The balanced equation

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)   ΔH = -802 kJ

<u>Step 2:</u> Given data

We notice that for 1 mole of methane (CH4), we need 2 moles of O2 to produce : 1 mole of CO2 and 2 moles of H20.

The enthalpy change of combustion, given here as  Δ H , tells us how much heat is either absorbed or released by the combustion of <u>one mole</u> of a substance.

In this case: we notice that the combustion of 1 mole of methane gives off (because of the negative number),  802.3 kJ  of heat.

<u>Step 3: </u>calculate the enthalpy change  for 3 moles

The -802 kj is the enthalpy change for 1 mole

The change in enthalpy for 3 moles = 3* -802 kJ = -2406 kJ

The change in enthalpy in the combustion of 3 moles of methane = -2406 kJ

5 0
3 years ago
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