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3 years ago

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Duncan takes a break from studying and goes to the gym to swim laps. If swimming burns 705 calcal per hour, how many kilojoules

does swimming burn in that same amount of time? In other words, convert 705 calcal to kilojoules. Express your answer numerically in kilojoules.

1 answer:

liraira [26]3 years ago

5 0

Answer:

705kj

Explanation:

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Nadusha1986 [10]

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How many grams of solute are needed to make 37.5 mL of 0.750 M KI solution? Round to three significant digits.

Marysya12 [62]

4.648 gm of solute is needed to make 37.5 mL of 0.750 M KI solution.

Solution:

We will start with the Molarity

$\text { Molarity }=\text { Mole of solute } \div \text { liter of solution }$

Also we know 1000 ml = 1 L

Therefore 37.5 ml by 1000ml we obtained 0.0375L

Equation for solving mole of solute

$\text { Mole of solute }=\text { Molarity } \times \text { Liters of solution }$

Now, multiply 0.750M by 0.0375

Substitute the known values in the above equation we get

$0.750 \times 0.0375=0.0281$

Also we know that Molar mass of KI is 166 g/mol

So divide the molar mass value to get the no of grams.

$0.028 \times 166=4.648$

So 4.648 gm of Solute is required for make 37.5 mL of 0.750 M KI solution.

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Krypton-79 has a half-life of 35 hours. how many half-lives have passed after 105 hours?

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