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NeTakaya
3 years ago
10

How many moles are in 15.0 grams of calcium (Ca)?

Chemistry
2 answers:
borishaifa [10]3 years ago
5 0
1 mol ---- 40g
X --------- 15g
X = 15/40 = 0,375 moles

:)
tatuchka [14]3 years ago
5 0

Answer:

The correct answer is option A.) 0.374 moles

Explanation:

Hello!

Let's solve this!

Calcium (Ca) has a mass of 40g / mol

In this case we have 15 g of Ca.

We need to calculate the amount of moles so the operation to be performed is as follows:

mol Ca = 15g * (1mol / 40g) = 0.375 mol

We conclude, after the calculations, that the correct answer is option A.) 0.374 moles

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A 60.0 g block of iron that has an initial temperature of 250. °C and 60.0 g bloc of gold that has an initial temperature of 45.
Maslowich

Answer:

The final temperature at the equilibrium is 204.6 °C

Explanation:

Step 1: Data given

Mass of iron = 60.0 grams

Initial temperature = 250 °C

Mass of gold = 60.0 grams

Initial temperature of gold = 45.0 °C

The specific heat capacity of iron = 0.449 J/g•°C

The specific heat capacity of gold = 0.128 J/g•°C.

Step 2: Calculate the final temperature at the equilibrium

Heat lost = Heat gained

Qlost = -Qgained

Qiron = -Qgold

Q=m*c*ΔT

m(iron) * c(iron) *ΔT(iron) = -m(gold) * c(gold) *ΔT(gold)

⇒with m(iron) = the mass of iron = 60.0 grams

⇒with c(iron) = the specific heat of iron = 0.449 J/g°C

⇒with ΔT(iron)= the change of temperature of iron = T2 - T1 = T2 - 250.0°C

⇒with m(gold) = the mass of gold= 60.0 grams

⇒with c(gold) = the specific heat of gold = 0.128 J/g°C

⇒with ΔT(gold) = the change of temperature of gold = T2 - 45.0 °C

60.0 *0.449 * (T2 - 250.0) = -60.0 * 0.128 * (T2 - 45.0 )

26.94 * (T2 - 250.0) = -7.68 * (T2 - 45.0)

26.94T2 - 6735 = -7.68T2 + 345.6

34.62T2 = 7080.6

T2 = 204.5 °C

The final temperature at the equilibrium is 204.6 °C

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Which physical method can be used for obtaining a sample of salt from a sm
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The physical method that can be used for obtaining a sample of salt from a small beaker of salt and water would be evaporation.

<h3>Separation of salt and water</h3>

A mixture of salt and water can be separated by a method known as evaporation. This is based on the assumption that the salt in question is a water-soluble salt.

In order to separate the salt/water mixture:

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Which physical method can be used for obtaining a sample of salt from a small beaker of salt water?

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