2 years ago

Make the equations for the reactions between calcium and hydrochloric acid, name the products.

1 answer:

3 0

Answer:

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide gas. 2HCl (aq) + CaCO 3(s) CaCl 2 (aq) + CO 2(g) + H 2 O (l).

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If a tablet of acetaminophen, C8H9NO2, weighs 324 mg, how many moles are there in the tablet? If a tablet of acetaminophen, C8H9

Gnoma [55]

Answer:

$2.14*10^{-3} mol$

Explanation:

number of moles of C8H9NO2 = $\frac{mass}{molar mass}=\frac{324*10^{-3} g}{151.163g/mol}=2.14*10^{-3}mol$

The trick is to remember to convert milligrams to grams because molar mass is normally presented in grams per mole

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2 years ago

[1] b) In a local election there were 8000 registered voters. Of these 3200 voted. What was the percentage that voted? [1] <

Alexandra [31]

Answer:

40% of registered voters voted

Explanation:

3200 out of 8000,

or :

3200 / 8000

= 0.4

0.4 x 100 = 40

40% of registered voters voted

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1 year ago

A. 2 pts: In terms of conservation of mass, what were the results of each experiment (which one conserved mass and which one did

Svetradugi [14.3K]

Answer:

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2 years ago

A match has about 21 milligrams of red phosphorus coating the tip. How many atoms of phosphorus is this?

MAXImum [283]

Answer:

4.083 * 10^20 atoms.

Explanation:

One Mole of phosphorus contains 6.022 * 10^23 atoms (Avogadros number)'

Since 1 mole of Phosphorus has a mass of 30.974 grams, 21 milligrams has

6.022 * 10^23 * 0.021 / 30.974

= 0.004083 * 10^23

= 4.083 * 10^20

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2 years ago

Why might a rubber raft burst if it is left in the sun on a summer day?

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The energy of the sum causes the rubber raft to burst when left in the sun

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3 years ago

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