3 years ago

What must be true for a substance to be able to dissolve in water?

Chemistry

1 answer:

JulsSmile [24]3 years ago

6 0

B. i think not 100% sure

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29.2 grams of methane (carbon tetrahydride), CH4, is how

Elena-2011 [213]

Answer:

1.83moles

Explanation:

Given parameters:

Mass of methane given = 29.2g

Unknown:

Number of moles = ?

Solution:

To find the number of moles in this mass of a compound;

Number of moles = $\frac{mass}{molar mass}$

Molar mass of CH₄ = 12 + 4(1) = 16g/mol

Now;

Number of moles = $\frac{29.2}{16}$ = 1.83moles

5 0

3 years ago

What best describes the bonding in a water molecule

finlep [7]

Answer:

An oxygen atom shares a single electron with each H

Explanation:

H:O:H

Covalent bond, so

An oxygen atom shares a single electron with each H.

8 0

3 years ago

Which statement is true about the products of two reactants that combine chemically?

Art [367]

I think its C i don't know if i am right

7 0

3 years ago

In an oven, 7000 kg of limestone are heated to over 900ºC to give lime and carbon dioxide. Assuming all calcium carbonate reacts

kirill [66]

Answer:

3920kg of lime(CaO) 1568m^3 of CO2

Explanation:

I attached the explanation!

also for calculating the volume I assumed Standard Temperature and Pressure(STP).

5 0

3 years ago

If a 0.320 mM solution of MnO41- has an absorbance of 0.480 at 525 nm in a 1.000 cm cell. What is the concentration of a MnO41-

larisa [96]

Answer:

Hence the concentration of a MnO41- solution that has absorbance of 0.490 in the same cell at that wavelength is 0.3266.

Explanation:

Now A = el, el=const

Then,

$A2 / A1 = C2/ C1\\\\0.49/ 0.48 = C2 / 0.32\\\\C2 = 0.3266$

3 0

3 years ago