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natima [27]
4 years ago
9

How would you write a balanced equation for the combustion of zinc sulfide?

Chemistry
1 answer:
lara31 [8.8K]4 years ago
6 0

Answer:

The solution is: ZnS + O^2 => ZnSO

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How many moles of zinc are there in 0.890 g of zinc?
NNADVOKAT [17]

Answer:

There are  

4.517

⋅

10

23

atoms of Zn in 0.750 mols of Zn.

Explanation:

Since we know that there are  

6.022

⋅

10

23

atoms in every mole of a substance (Avogadro's Number), there are  

6.022

E

23

⋅

0.750

atoms of Zn in 0.750 mols of Zn.

4 0
3 years ago
Read 2 more answers
Please solve number 5!! I’ll mark most brainliest!
sweet-ann [11.9K]
D. 5.25 ml
Jejsjsnxnnsnsbdbbdbdbd
7 0
4 years ago
Read 2 more answers
Is 6.0 × 10 to the negative 4th power is a significant figure?​
Dmitry_Shevchenko [17]

Answer:

Yes

Explanation:

First remember that a significant figure are basically values that contribute to the precision of a value. In any scientific notation the values are significant figures because these values stay the same. In this case we have two significant figures which is 6 and 0, you can further prove that they are significant figures by converting the notation into standard form.

6.0\times10^{-4}

Negative so move the decimal point to the left:

=0.00060

6 and 0 are the significant figures in this standard notation because it's precise to it's actual value which is 6.0.

To sum up, the values you have on the left side of a notation are significant figures since they will not change no matter if it's standard or scientific notation meaning it's precise.

Hope this helps.

6 0
3 years ago
. A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. Th
mafiozo [28]

Answer:

The concentration of CaCl2 in this solution is 0.564 molar (option A)

Explanation:

Step 1: Data given

Mass of CaCl2 = 23.7 grams

Mass of water = 375 grams

Density of solution is 1.05 g/mL

Step 2: Calculate total mass

Total mass = mass of CaCl2 + mass of water

Total mass = 23.7 grams + 375 grams = 398.7 grams

Step 3: Calculate volume of the solution

Density = mass / volume

Volume = mass / density

Volume = 398.7 grams / 1.05 g/mL

Volume = 379.7 mL = 0.3797 L

Step 4: Calculate moles CaCl2

Moles CaCl2 = mass CaCl2 / molar mass CaCl2

Moles CaCl2 = 23.7 grams / 110.98 g/mol

Moles CaCl2 = 0.214 moles

Step 5: Calculate concentration

Concentration of CaCl2 = moles / volume

Concentration of CaCl2 = 0.214 moles / 0.3797 L

Concentration of CaCl2 = 0.564 mol / L = 0.564 molar

The concentration of CaCl2 in this solution is 0.564 molar (option A)

8 0
4 years ago
what is true of chemicals a- chemicals are never dangerous b- things containing chemicals cost alot of money c-chemicals are rar
Maslowich

Answer: option d

Explanation:

Because every thing in our home is made from chemicals

7 0
4 years ago
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