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alisha [4.7K]
3 years ago
15

A-potassiumB-leadC-ironD-magnesiumE-zinc​

Chemistry
1 answer:
viktelen [127]3 years ago
6 0

The unknown substance : Lead

<h3>Further explanation</h3>

Given

Density of element

mass of unknown substance = 40 g

volume = 3.5 cm³

Required

The density of unknown substance

Solution

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³ or kg/m³  

Density formula:  

\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}

Input the value to find the density of an unknown substance :

ρ = 40 g : 3.5 cm³

ρ = 11.43 g/cm³

If we look at the table, the substance which has a density of 11.43 is Lead

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When 0.250 moles of LiCl are added to 200.0 g of water in a constant pressure calorimeter a temperature change of +11.08°C is ob
Nonamiya [84]

Answer:

3.91 × 10⁴ J/mol

Explanation:

We can calculate the heat of solution using the following expression.

Q = c × m × ΔT

where,

c is the specific heat capacity of the solution

m is the mass of the solution

ΔT is the change in the temperature

The mass of LiCl is:

0.250mol.\frac{42.39g}{mol} =10.6g

The mass of the solution is:

m = mLiCl + mH₂O = 10.6 g + 200.0 g = 210.6 g

Q = c × m × ΔT = (4.184 J g⁻¹ °C⁻¹) × 210.6 g × 11.08 °C = 9763 J

In a constant pressure calorimeter, the molar enthalpy of solution for LiCl is:

\Delta H_{sol}=\frac{9763J}{0.250mol} =3.91 \times 10^{4} J/mol

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3 years ago
A farmer has a 10 acre plot to feed his family. What is the most efficient way to use the plot?
nordsb [41]
B. because the meat has more protein and so does the milk
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Two chemical reactions that you should be familiar with are photosynthesis and respiration. In photosynthesis, the energy of the
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Photosynthesis is endothermic while respiration is exothermic reaction.

Explanation:

Photosynthesis:

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water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture  by chloroplast.

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6H₂O + 6CO₂ + energy  →   C₆H₁₂O₆ + 6O₂

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3 0
3 years ago
Would you classify the atoms in the table as pure substances?
ivann1987 [24]

Answer:

Yes

Explanation:

Atoms are generally classified as pure substances. A pure substance has the following properties:

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Elements and compounds are generally classified as pure substances. Since atoms are the building blocks of pure substances, they can be classified as one.

3 0
3 years ago
How many grams are in .98 mols of C6H12O6 (*round to the nearest hundredth and include the unit "g C6H12O6" after your number)
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Find 1 mol
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Note: anyone responding will use rounded numbers for the atomic mass. All periodic tables have variations in them. Use your periodic table to get the better atomic mass.

Answer
176.40 g C6H12O6 <<<<
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