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2 years ago

What is the mass in grams of 1.73 moles CaH2

Chemistry

1 answer:

Nata [24]2 years ago

4 0

Mass in grams = no. of moles multiply by molar mass
molar mass is 42 so by putting value we get 72.66 grams...

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A diver exhales a bubble with volume of 250 mL at pressure of 2.4 atm and temperature of 15 C. How many gas particulate in this

erastova [34]

Answer:

1.5x10²² particulates

Explanation:

Assuming ideal behaviour, we can solve this problem by using the <em>PV=nRT </em>formula, where:

P = 2.4 atm

V = 250 mL ⇒ 250 / 1000 = 0.250 L

n = ?

R = 0.082 atm·L·mol⁻¹·K⁻¹

T = 15 °C ⇒ 15 + 273 = 288 K

We <u>input the given data</u>:

2.4 atm * 0.250 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 288 K

And <u>solve for n</u>:

n = 0.025 mol

Finally we <u>calculate how many particulates are there in 0.025 moles</u>, using <em>Avogadro's number</em>:

0.025 mol * 6.023x10²³ particulates/mol = 1.5x10²² particulates

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2 years ago

What is melting point depression?and when it accurse?

Dahasolnce [82]

<span>A melting point is the characteristic physical property of a substance. So melting point analysis is one of the simplest and most useful techniques for identifing of a chemical substance. Melting point analysis can also provide information about the purity of a sample. A substance containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures. The smaller the range of melting temperatures, the higher the purity of the sample.</span>

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3 years ago

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A scientist collects 0.24 mole of hydrogen gas in a balloon. The temperature of the hydrogen is 35°C, and the pressure in the ba

Delicious77 [7]

Answer:

24.082 liters

Explanation:

You can solve this question using ideal gas formula. There are a few factors that will determine the volume(V) of gas, the number of the gas molecules (n), pressure(P), and temperature(T). You also need coefficient (R) which will depend on the unit used in pressure. We will use R= 0,08206 L atm K-1 mol-1 here. Don't forget to change the Celcius temperature into Kelvin.

PV=nRT

V= nRT/P

V = 0.08206 L atm/Kmol * (35+273.15) K /1.05 atm

V= 24.082 L

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2 years ago

Look at the products of the chemical reaction to determine if the reactant added to water caused an acid reaction, a base reacti

Feliz [49]

1. The reaction is a neutralization reaction

2. The reactant added to the water causes an acid reaction

3. The reactant added to the water causes a base reaction

4. The molarity of the solution is 0.025 M

<h3>What is a neutralization reaction? </h3>

This is a reaction involving an acid and a base which result in the formation of salt and water only

HF + NaOH –> H₂O + NaF

The reaction above indicates neutralization since the reaction produces water (H₂O) and salt (NaF) only

An acid is a substance which dissolves in water to produce hydronium ion H₃O⁺

3HI + 2H₂O —> 2H₃O⁺ + 3I¯ + H⁺

The reaction above is an acid reaction since it produces H₃O⁺

A base is a substance which dissolves in water to produce hydroxide ion OH¯

2CH₃COO¯ + H₂O —> CH₃COO¯ + OH¯ + CH₃COOH

The reaction above is a base reaction since OH¯ is produced.

<h3>How to determine the molarity </h3>

Mole = 0.05 mole
Volume = 2 L

Molarity =?

Molarity = mole / Volume

Molarity = 0.05 / 2

Molarity = 0.025 M

Learn more about molarity:

brainly.com/question/9468209

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1 year ago

Which is a big idea of physical science?

Ivanshal [37]

Forces and Motion, Space and Time, Energy, and Nature of Matter

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3 years ago

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