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Nuetrik [128]
3 years ago
5

An atom of boron has an atomic number of 5 and an atomic mass of 11. The atom contains (2 points)

Chemistry
1 answer:
Nesterboy [21]3 years ago
7 0

C) 5 protons, 5 electrons, and 6 neutrons

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Explanation:

SOLID

Sodium hydroxide exists in the solid phase at room temperature. You would find it in the lab as hemispherical white solid pellets. The phase of a substance depends on temperature and pressure. As you heat a solid, it will melt and change to the liquid phase.

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The element phosporus is located to the right of the element magnesium along the same period in the periodic table. Which best d
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B. Phosphorus has a larger atomic mass.

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The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C
Kipish [7]

Answer: 72 grams of O_2(g) are needed to completely burn 19.7 g C_3H_8(g)

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According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

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\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles

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7 0
3 years ago
If the mass of the object below is 28g, what is the density of the object below. Units are in cm below. Please round your answer
Murljashka [212]

Answer:

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Explanation:

Given data:

Mass of object = 28 g

Volume of object = 3cm×2cm×5cm

density of object = ?

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Volume of object = 3cm × 2cm ×5cm

Volume of object = 30 cm³

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by putting values,

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