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4 years ago

MULTIPLE CHOICE

Chemistry

1 answer:

algol [13]4 years ago

4 0

What we can actually do is to find the number of moles of Ca.

moles Ca = 0.72 g / (40.08 g/mol) = 0.018 mol

From the given choices, we can all see that there are 1 mol of compound per 1 mole of Ca. Therefore the actual moles of compound is also 0.018 mol. From this, calculate the mass and the answer is the one which will give 2 g.

Answer:

D. CaCl2

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Be sure to answer all parts. Acetone is one of the most important solvents in organic chemistry. It is used to dissolve everythi

Kazeer [188]

Answer:

Half life = 79.67 sec

Explanation:

Given that:

k = $8.7\times 10^{-3}\ s^{-1}$

The expression for half life is shown below as:-

$t_{1/2}=\frac{\ln2}{k}$

Where, k is rate constant

So,

$t_{1/2}=\frac{\ln2}{8.7\times 10^{-3}\ s^{-1}}$

$t_{1/2}=114.94252\ln \left(2\right)\ sec=79.67\ sec$

Half life = 79.67 sec

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3 years ago

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3 years ago

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3 years ago

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The solubility of the ionic compound MX3, having a molar mass of 288 g/mol, is 3.60 x 10-2 g/L. Calculate the KSP of the compoun

GarryVolchara [31]

$K_{sp}$ of the compound is found to be 5.04 × $10^{-10}$ .

Solubility :Solubility can be define as the amount of a substance that dissolves or mixes in a given amount of solvent at specific conditions.

Solubility equilibrium

Ksp = $[A^{+} ]^{a}$ $[B^{-} ]^{b}$

Ksp = solubility product constant

A+ = cation in an aquious solution

B- = anion in an aqueous solution

a, b = relative concentrations of a and b

Given,

Solubility = s = 3.60 × $10^{-2}$ g/L

molar mass = 288 g/ mol

∴ s= 3.60 × $10^{-2}$ g/L ÷ 288 g/ mol = 1.25 × $10^{-4}$ mol/ L

Reaction:

MX3 ⇄ M + 3X

s 3s

$K_{sp}$ =[ $M^{+3}$ ] [ $X^{-1}$ $]^{3}$ = solubility product

∴ $K_{sp}$ = $[s]^{} [3s]^{3}$

∴ $K_{sp}$ = 3 $s^{4}$

∴ $K_{sp}$ = 3 × (3.60 × $10^{-2}$ $)^{4}$

∴ $K_{sp}$ = 503.8848 × $10^{-8}$ = 5.04 × $10^{-10}$

Learn more about solubility here .....

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2 years ago

Kevin has 5 fish in his fish tank jasmine has 4 times as many fish as Kevin.How many fish does jasmine have?

madreJ [45]

Jasmine have 20 fish because4 times 5 equals 20

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4 years ago