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AfilCa [17]
3 years ago
5

An ion always has a ________ or ________ charge. While a covalent bond always has no _________, meaning it is __________.

Chemistry
1 answer:
almond37 [142]3 years ago
5 0
An ion has a positive or negative charge. While a covalent bond always has no charge, meaning it is neutral. 
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How many moles are present in 63.80L of oxygen gas, O2?
matrenka [14]

Answer:

2.85moles of oxygen gas

Explanation:

Given parameters:

Volume of oxygen gas  = 63.8L

Unknown:

Number of moles  = ?

Solution:

We assume that the gas is under standard temperature and pressure. To find the number of moles, use the expression below:

     1 mole of a gas at STP occupies a volume of 22.4L

 So;

       63.8L of oxygen gas will take up a volume of

              \frac{63.8}{22.4}   = 2.85moles of oxygen gas

4 0
3 years ago
0.055 grams of PbSO4 is dissolved in 200.00 grams of H2O.
Greeley [361]

Answer:

Solution's mass = 200.055 g

[PbSO₄] = 275 ppm

Explanation:

Solute mass = 0.055 g of lead(II) sulfate

Solvent mass = 200 g of water

Solution mass = Solvent mass + Solution mass

0.055 g + 200 g = 200.055 g

ppm = μg of solute / g of solution

We convert the mass of solute from g to μg

0.055 g . 1×10⁶ μg/ 1g = 5.5×10⁴μg

5.5×10⁴μg / 200.055 g = 275 ppm

ppm can also be determined as mg of solute / kg of solution

It is important that the relation is 1×10⁻⁶

Let's verify: 0.055 g = 55 mg

200.055 g = 0.200055 kg

55 mg / 0.200055 kg = 275 ppm

6 0
3 years ago
What should i buy from target.i was given 100 dollars. serious answers only!
denis23 [38]

Answer:

save it for future references

Explanation:

3 0
3 years ago
Read 2 more answers
How many moles are present in 44.8 L of nitrogen gas (Na)?
gayaneshka [121]

Answer:

two moles

There are two moles.

Explanation:

5 0
3 years ago
Show calculations for determining the mass of sugar in an 8 oz sample of soft drinks.​
poizon [28]

Answer:

m_{sugar}=23.7g\ sugar

Explanation:

Hello,

In this case, we can first compute the volume of the sample in mL from the ounces:

8oz*\frac{29.5735mL}{1oz} =236.6mL

Thus, with the volume of the sample, we can compute the amount of sugar given the 10 g of sugar per 100 mL of soft drink as shown below:

m_{sugar}=236.6mL*\frac{10g\ sugar}{100mL}\\ \\m_{sugar}=23.7g\ sugar

Best regards.

7 0
3 years ago
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