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Yanka [14]
3 years ago
13

How many grams of CaCI2 (molar mass = 111 g/mol) are needed to prepare 100.mL of 0.100 M CI-(aq) ions?

Chemistry
1 answer:
Ede4ka [16]3 years ago
4 0

Answer:

a

Explanation:

Because that is the answer

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Oliver heated tungsten cylinder weighing 60 g in a hot water bath. While that was heating , he added 40.37 g of distilled water
Anuta_ua [19.1K]

Answer:

21.12°C

Explanation:

Q = m×c×∆T

Where;

m= mass

c= specific heat capacity

∆T = change in temperature

Qwater = - (Qtungsten)

Note that; the initial temperature of tungsten = final temperature of water

For Water, m= 40.37g, initial temperature=21.3°C, c= 4.184J/g°C

For tungsten, m= 60g, final temperature=24.9°C, c= 0.132J/g°C

(m×c×∆T)water = - (m×c×∆T)tungsten

40.37 × 4.184 × (T-21.3) = - {60 × 0.132 × (24.9-T)}

168.91 (T-21.3) = - { 7.92 (24.9-T)}

168.91T - 3597.8 = - (197.21 - 7.92T)

168.91T - 3597.8 = - 197.21 + 7.92T

168.91T - 7.92T = - 197.21 + 3597.8

160.99T = 3400.59

T = 3400.59/160.99

T = 21.12°C

Therefore, the initial temperature, in °C of tungsten cylinder is 21.12°C

8 0
2 years ago
A change that produces a new substance is a _______ change
Arturiano [62]

Answer is chemical change

4 0
2 years ago
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How many moles of Mg(OH)2(aq) would be required to neutralize 6.0 mol HCl(aq)?
jekas [21]

Answer:

3.0molMg(OH)_2

Explanation:

Hello there!

In this case, for these types of acid-base neutralizations, it is crucial to firstly set up the chemical reaction taking place between the acid and the base; in this case HCl and Mg(OH)2 respectively, whose products are obtained by switching around the anions and cations as shown below:

HCl(aq)+Mg(OH)_2(aq)\rightarrow MgCl_2(aq)+H_2O(l)

Which must be balanced to accurately predict the mole ratio on the reactants side:

2HCl(aq)+Mg(OH)_2(aq)\rightarrow MgCl_2(aq)+2H_2O(l)

Whereas we can see a 2:1 mole ratio of the acid to the base; thus, the moles of Mg(OH) required for the neutralization of 6.0 moles of HCl turn out to be:

6.0molHCl*\frac{1molMg(OH)_2}{2molHCl} \\\\=3.0molMg(OH)_2

Best regards!

5 0
3 years ago
How do you scientist learn about the moon in other planets
Citrus2011 [14]

Answer:NASA's Lunar Atmosphere and Dust Environment probe, for instance, orbits the moon and collects information about its atmosphere and surface. This important data can help scientists learn more about moons, asteroids and other objects in the solar system.

Explanation:

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3 years ago
Balance this chemical equation. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coeffici
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The first one have a nice day and good luck
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