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3 years ago

What property has helium,iron,oxygen

Chemistry

1 answer:

lina2011 [118]3 years ago

8 0

I cant find the property of that

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Students in Ms. Brown’s class are on a field trip at the aquarium. They observe the following biotic and abiotic factors in the

Virty [35]

Rocks - abiotic

Coral - biotic

Seaweed - biotic

Clownfish- biotic

sea turtle - biotic

water system - abiotic

7 0

3 years ago

Read 2 more answers

The activation energy for the gas phase isomerization of cyclopropane is 272 kJ. (CH2)3CH3CH=CH2 The rate constant at 718 K is 2

MrMuchimi

The Arrhenius equation relates activation energy to reaction rates and temperature:
ln (k2 / k1) = (E / R) * (1/T1 - 1/T2), where E is activation energy of 272 kJ, R is the ideal gas constant (we use the units of 0.0083145 kJ/mol-K for consistency, to cancel out the kJ unit), we let T1 = 718 K and k1 = 2.30 x 10^-5, and T2 = 753 K and k2 be the unknown.
ln (k2 / 2.30x10^-5) = (272 kJ / 0.0083145 kJ/mol-K) * (1/718 - 1/753)
k2 = 1.91 x 10^-4 /s

5 0

3 years ago

A rigid vessel contains 2.5 mol of H2(g). How many grams of hydrogen are in the vessel.

aleksandr82 [10.1K]

Answer:

5 g of H₂ are contained in the vessel

Explanation:

A typical excersise of conversion:

We determine molar mass of H₂.

This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.

Let's make the conversion of units:

2.5 mol . 2g/mol = 5 g

5 g of H₂ are contained in the vessel

4 0

3 years ago

4) Acompound has an empirical formula of Na2co3, and a molar mass of 3.18g/mol. Find its

butalik [34]

Answer:

sorry im not in physics

Explanation:

8 0

3 years ago

You need to prepare 250.0 mL of a 1.35 M HCl solution from a 2.00 M HCl stock solution.

Lyrx [107]

Answer:

a. C. volumetric flask

b. B. Measure out x mL using a volumetric pipet

c. 168.75mL

d. B. Add the correct amount of stock solution then fill to the 250 mL mark with water.

Explanation:

The volumetric flask is mainly used in analytical chemistry to contain standard solutions or to prepare dilutions of a certain concentration of a reagent.
The volumetric pipette is used to deliver a given volume with greater precision and accuracy.
To make a dilution, the formula C1*V1 = C2*V2 is used where C is the concentration of the solution, in this case of molarity. V is the volume of the solution in ml and terms 1 and 2 correspond to the concentrated and diluted solutions respectively.

$V2=\frac{1.35M*250mL}{2.00M} =168.75mL$

8 0

3 years ago