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4 years ago

The particle that adds mass but no charge to the atomic nucleus is the

Chemistry

1 answer:

andrew-mc [135]4 years ago

6 0

The particle that adds mass but no charge to the atomic nucleus is the neutron.

The nucleus contains both protons and neutrons.

Protons and neutrons have about the same mass.

However, protons have a positive charge, while <em>neutrons have no charge</em>,

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3 years ago

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How many grams of calcium chloride would you need to make 1 L of solution containing 5 ppm calcium (Ca)?

Tresset [83]

Explanation:

The given data is as follows.

Volume = 1 L, Concentration of Ca = 5 ppm or 5 mg/L

As 1 mg = 0.001 g so, 5 mg /L will be equal to 0.005 g/l. Molar mass of calcium is 40.078 g/mol.

Hence, calculate molarity of calcium as follows.

Molarity of Ca = $\frac{\text{given concentration}}{\text{molar mass}}$

= $\frac{0.005 g/l}{40.078 g/mol}$

Molarity of Ca = $1.25 \times 10^{-4} M$

Hence, molarity of $CaCl_{2}$ is $1.25 \times 10^{-4} M$ . Since, volume is same so, moles of calcium chloride will be $1.25 \times 10^{-4} mol$ .

Thus, we can conclude that mass of $CaCl_{2}$ will be as follows.

$1.25 \times 10^{-4} \times 110.984$ (molar mass of $CaCl_{2}$ = 110.984 g/mol)

= 0.0138 g

Thus, we can conclude that mass of $CaCl_{2}$ is 0.0138 g.

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3 years ago

What is the volume of 1.50 lb (pounds) of mercury? The density of mercury is 13.546 g/mL. Use the conversion that 1 kg = 2.20 lb

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Answer:

50.3mL of mercury are in 1.50lb

Explanation:

Punds are an unit of mass. To convert mass to volume we must use density (13.546g/mL). Now, As you can see, density is in grams but the mass of mercury is in pounds. That means we need first, to convert pounds to grams to use density and obtain volume of mercury.

<em>Mass mercury in grams:</em>

1.50lb * (1kg / 2.20lb) = 0.682kg = 682g of mercury.

<em>Volume of mercury:</em>

682g Mercury * (1mL / 13.546g) =

<h3>50.3mL of mercury are in 1.50lb</h3>

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4 years ago

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Explanation:

Mike drives his car 60 km in 55minutes. What is its average speed in kilometers per hour ? A train travels 120 km in 2 hours and 30 .

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