To which of the following industries do fish make a vital contribution?

A salt shaker is filled with 25 g sodium chloride. How many mole(s) of nacl does it contain?

AleksAgata [21]

Considering the definition of molar mass, a salt shaker contains 0.43 moles of sodium chloride.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

<h3>Molar mass of NaCl</h3>

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound NaCl is calculated as:

NaCl= 23 g/mole + 35.45 g/mole

Solving:

NaCl= 58.45 g/mole

<h3 /><h3>Amount of moles of 25 grams of NaCl</h3>

Next, you can apply the following rule of three: If by definition of molar mass 58.45 grams of the compound are contained in 1 mole, 25 grams of the compound are contained in how many moles?

$amount of moles=\frac{25 gramsx1 mole}{58.45 grams}$

<u><em>amount of moles= 0.43 moles</em></u>

Finally, a salt shaker contains 0.43 moles of sodium chloride.

Learn more about molar mass:

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2 years ago

One function of money is to allow comparisons between goods. For example, it would be difficult to compare "apples to oranges" i

cluponka [151]

Answer:True

Explanation:

7 0

3 years ago

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it was once recorded that a jaguar left skid marks that were 290 m in length. assuming that the jaguar skidded to a stop with a

jonny [76]

Answer:

4

Explanation:

5 0

3 years ago

Discuss what it means to internalise rules ,values ,how adults and teachers can help learners to do this ?

max2010maxim [7]

When a person is said to internalise a value, it simply means that those values have become a part of that person and it is integrated as part of his value system.

In schools, teachers try to internalise the good values in children such as respect, obedience, hard work, morality, etc.

A teacher or another adult can do this in a kid by teaching them how to say please when they want something, thank you when they want to show appreciation and sorry when they offer an apology.

Learners can do this by positively reinforcing good values and punishing bad values in children.

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4 0

2 years ago

Paul, colin and brian are waiters. One night the restaurant earns tips totalling £77. 40. They share the tips in the ratio 2:3:4

EleoNora [17]

Answer:

$17.20

Explanation:

To easily get the ratio figured out between Paul, Colin and Brian, try seeing how much the ratio adds up to. With 2:3:4, there is a total of 9; so take 1/9th of 77.40 to get $8.60

You can convert these ratios to fractions, with Paul getting 2/9ths, Colin getting 3/9ths and Brian getting 4/9ths

As Brian is effectively getting double the amount of money, you can just take the amount Paul is getting in tips and use that as the reference for how much Brian is earning which is $8.60 x 2 or in this case, $17.20

6 0

2 years ago