3 years ago

HELP WITH CHEMISTRY!!! PLeeeeeeeeeaaaaasssseee

Chemistry

2 answers:

Tcecarenko [31]3 years ago

7 0

The first question should be B as the correct answer

Bad White [126]3 years ago

3 0

The answers to your questions:

1: B.

2: True

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to find the mass of 3.2 moles of calcium for carbonate which of the following is used to calculate the amount

natka813 [3]

I believe it to be g/mol of Calcium carbonate
because to finde mass...u must have grams(g) as units....
it is the only one that have g as units

as for the first answer the avogadros number gives u the number of atoms in one mole of calcium carbonate....
the second one is based on ... At s.t.p one mole of gas occupies 22.4 dm³⇒to find volume

6 0

3 years ago

A balloon is inflated such that a radius is 7 cm what is the volume of air inside the balloon in milliliters

DedPeter [7]

Answer:

$V=14373.33\ \text{mm}^3$

Explanation:

It is given that,

The radius of the inflated balloon is 7 cm.

We need to find the volume of air inside the balloon in milliliters.

The balloon is in the shape of a sphere whose volume is given by :

$V=\dfrac{4}{3}\pi r^3\\\\\text{Put r = 7 cm}\\\\V=\dfrac{4}{3}\times \dfrac{22}{7}\times 7\times 7\times 7\\\\V=1437.33\ \text{cm}^3\\\\\text{We know that, 1 cm = 10 mm}\\\\\text{So},\\\\V=14373.33\ \text{mm}^3$