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2 years ago

What is the molar mass of Al(BrO2)

Chemistry

1 answer:

ivanzaharov [21]2 years ago

7 0

Answer:

The molar mass is 138.8843 g/mol

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Under which conditions does a sample of the same mass of carbon dioxide have the lowest

hjlf

The answer is B, as a solid and a low temperature would result in the lowest entropy value

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2 years ago

4. The nucleus of an atom is positively charged due to<br>A. electrons b. neutrons C. proton D. Ion

FinnZ [79.3K]

Answer:

Protons

Explanation:

Electrons have a negative charge which are found in shells around the nucleus. The nucleus consists of protons and neutron and the neutron has a neutral charge.

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2 years ago

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Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 75% of the carbon-1

liraira [26]

Answer: 1145.8 years

Explanation:

Half-life of carbon-14 = 5720 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{5720\text{years}}$

$k=1.21\times 10^{-4}\text{years}^{-1}$

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}\text{years}^{-1}$

t = age of sample = ?

a = let initial amount of the reactant = 100 g

x = amount decayed = 75 g

a - x = amount left after decay process = 100 - 75 = 25g

Now put all the given values in above equation, we get

$t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}$

$t=1145.8years$

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2 years ago

Read 2 more answers

What mass is in 5 moles of helium?

ArbitrLikvidat [17]

Answer:

Mass = 20 g

Explanation:

Given data:

Number of moles of He = 5 mol

Mass of He = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass = 4 g/mol

by putting values,

5 mol = Mass / 4 g/mol

Mass = 5 mol × 4 g/mol

Mass = 20 g

3 0

2 years ago

For each of the following ionic bonding examples, show the transfer of electrons, the ions resulting with the charges and the fi

fgiga [73]

Answer:

BaO

Ba gives up two electrons and becomes Ba⁺²
O takes two electron and becomes O⁻²

Al₂O₃

Mg₃P₂

Na₂O

CaCl₂

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2 years ago