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labwork [276]
3 years ago
14

A 650.0 g hard-water sample contains 101 mg Ca.what is this concentration in parts per million

Chemistry
1 answer:
ki77a [65]3 years ago
8 0

Answer:

= 155 ppm

Explanation:

PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in a 1000 mL, equivalent to 1 mg per liter

Given that;

101 mg of Ca in 650.0 g of water

1 ppm = 1 mg/L

650 g = 650 mL = 0.65 L

Therefore;

= 101 mg/ 0.65 L

=  155.38 mg/L

<u>= 155 ppm</u>

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If sea water has a density of 1.025 kg/L and 3.5% of the mass in sea water is salt, determine the mass of salt dissolved in 500
Alja [10]

68 kg. There are 58 kg salt in 500 gal seawater.

<em>Step 1.</em> Convert gallons to litres

1 US gal = 3.79 L (1 Imp gal = 4.55 L)

<em>Step 2</em>. Find the volume of the seawater

Volume = 500 gal × (3.79 L/1 gal) = 1895 L

<em>Step 3</em>. Find the mass of the seawater

Mass = 1895 L × (1.025 kg/1 L) = 1942 kg

<em>Step 4</em>. Find the mass of the salt

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4 years ago
How many independent variables can be tested in a standard scientific experiment
Shalnov [3]

One independent variable

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4 years ago
In run 1, you mix 8.0 mL of the 43 g/L MO solution (MO molar mass is 327.33 g/mol), 2.60 mL of the 0.040 M SnCl2 in 2 M HCl solu
Phantasy [73]

The concentration of [Sn⁺²] will be calculated by first calculating the moles of SnCl₂ added as these moles will give us the moles of [Sn⁺²] ion.

Moles of SnCl₂ = molarity X volume = 0.04 X 2.60 = 0.104 milli moles [as volume is in mL]

The moles of [Sn⁺² = 0.104 mmol

the total volume in solution = volume due to MO + volume due to SnCl₂ + volume due to HCl + volume due to NaCl

Total volume = 8+2.60+5.43+3.73= 19.76 mL

Concentration = moles / volume

concentration [Sn⁺²]  = 0.104mmol / 19.76 mL = 0.0053 mol / L

4 0
3 years ago
Compounds with high melting points have _____
solong [7]

Answer:

C) Ionic bonds

Explanation:

The ionic bonds are the strongest bond, it occurs when a metal donates electrons and a nonmetal gain these electrons. They'll be together by electrostatic force.

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Covalent bonds are the weakest bond. It happens between metals and nonmetals, or nonmetals and hydrogen or between atoms of hydrogen. The force that joins the atoms depends on the polarity of the molecule. Polar molecules have dipole forces, nonpolar molecules, induced dipole forces. Also, hydrogen makes special dipole forces with nitrogen, oxygen, and fluorine, called hydrogen bond.

As the stronger is the force, as difficult it will be to break it. So, ionic bonds will demand more energy to become gas, and have high melting points.

3 0
4 years ago
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Answer:

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