What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?

Answers

Answer 1

Answer: ANSWER - 48.83%

Mg - 24.31
S - 32.07
O - 16x4 - 64
ADD ALL TOGETHER = 120.38

H - 1.01x2 - 2.02
O - 16
TOTAL = 18.02x7 = 126.14

ADD 120.38 to 126.14 = 246.52
last part divide MgSO4 by total compound mass
120.38/246.52 then multiply by 100 = 48.831

Answer 2

Answer:

Answer:

48.83

Explanation:

Edg

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What is the molar mass of CaSO4 ?

Answers

The molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).

To calculate the molar mass of CaSO₄ (calcium sulfate), you need to sum up the atomic masses of all the individual atoms in the chemical formula.

The atomic masses (molar masses) of the elements are as follows:

Calcium (Ca) has a molar mass of approximately 40.08 g/mol.

Sulfur (S) has a molar mass of approximately 32.06 g/mol.

Oxygen (O) has a molar mass of approximately 16.00 g/mol.

Now, let's calculate the molar mass of CaSO₄:

Molar mass of CaSO₄ = (Molar mass of Ca) + (Molar mass of S) + 4 × (Molar mass of O)

Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 4 × 16.00 g/mol

Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 64.00 g/mol

Molar mass of CaSO₄ = 136.14 g/mol

So, the molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).

Learn more about molar masses from the link given below.

brainly.com/question/31545539

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Ca = 40
S= 32
O=16
so... 40+32+(16X4) = 136

Mohs Scale of Mineral Hardness Hardness Mineral Absolute Hardness 1 Talc 1 2 Gypsum 2 3 Calcite 9 4 Fluorite 21 5 Apatite 48 7 Quartz 100 8 Topaz 200 According to the Moh's Scale of Mineral Hardness, the sample mineral that will scratch gypsum but not apatite is MOST LIKELY A) calcite. B) quartz. C) talc. D) topaz.

Answers

Answer: A) calcite

Explanation:

Hardness can be defined as the ability of the mineral to resist the scratch. It is the property to judge the hardness of the mineral. Mineralogist study this property of hardness using Mohs hardness scale.

Talc is the least hard substance after that gypsum, then calcite, fluorite, and then apatite.

The gypsum can be scratched by the calcite but the calcite cannot scratch apatite as it is softer than apatite.

4.00 × 1023 molecules of H3PO4 have an approximate mass of

Answers

Answer : The approximate mass of $H_3PO_4$ is 65 grams.

Explanation :

First we have to calculate the moles of $H_3PO_4$ .

As, $6.022* 10^(23)$ molecules of $H_3PO_4$ present in 1 mole of $H_3PO_4$

So, $4.00* 10^(23)$ molecules of $H_3PO_4$ present in $(4.00* 10^(23))/(6.200* 10^(23))=0.664$ mole of $H_3PO_4$

Now we have to calculate the mass of $H_3PO_4$ .

$\text{Mass of }H_3PO_4=\text{Moles of }H_3PO_4* \text{Molar mass of }H_3PO_4$

Molar mass of $H_3PO_4$ = 98 g/mole

$\text{Mass of }H_3PO_4=0.664mole* 98g/mole=65.072g\approx 65g$

Therefore, the approximate mass of $H_3PO_4$ is 65 grams.

1 mole --------- 6.02 x 10²³ molecules
? mole --------- 4.00 x 10²³ molecules

moles = (4.00 x 10²³) x 1 / 6.02 x 10²³

moles = ( 4.00 x 10²³) / ( 6.02 x 10²³ )

= 0.6644 moles

Molar mass H₃PO₄ = 98.0 g/mol

mass = 0.6644 x 98.0 = 65.1112 g

hope this helps!

A catalyzed reaction will have a ____ activation energy, and this leads to a _____ in the reaction rate. A) lower, decrease
B) lower, increase
C) higher, decrease
D) higher, increase

Answers

I chose d and got it wrong. The correct answer is b.

The answer is D, a catalyst speeds up the reaction rate so a catalyzed reaction will have higher activation energy thus and increase in rate of reaction.

To ensure accurate recall of the experimental data, at minimum one should

Answers

To ensure accurate recall of the experimental data, at minimum one should keep a record of the data of all the experiments done. Also, the date when it is recorded is important so as to support that the data is real and not only made up.

Answer:

record the data in writing

Explanation:

How does the skin help regulate body temperature?

HELP FAST

Answers

Answer:

1. The body's immense blood supply (when blood vessels dilate or become larger heat loss occurs) When the blood vessels constrict it holds in heat

2. The skins blood supply also helps maintain body temperature (helps maintain homeostasis which is the "normal" state of our body)

3. Humidity in the air effects thermoregulation (heat regulation in the body) by limiting sweat evaporation (usually sweat evaporates into the environment when the humidity is low because the air has low "water levels" per say while you have high "water levels" because of your sweat

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