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4 years ago

What is the molar mass for H2O2

Chemistry

1 answer:

Novosadov [1.4K]4 years ago

4 0

I got 34.0147 g/mol
Sorry if it’s wrong, I’m only in 7th grade and I haven’t really learned about this..

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A box has dimensions 0.2 mx 0.4 m x 0.6 m. What is the

AnnyKZ [126]

Answer:

$V=0.048m^3$

Explanation:

Hello,

In this case, since the volume is computed by multiplying the given dimensions as follows:

$V=0.2m*0.4m*0.6m$

The result is shown in cubic meters since each meter is also added:

$V=0.048m^3$

Best regards.

5 0

3 years ago

the length of a string is 16cm.Its length becomes 20cm when supporting a weight of 5N.Calculate the length of the string when su

guapka [62]

Answer:

Explanation:

According to hooks law "provide the elastic limit of an elastic material is not exceeded the extension e is directly proportional to the applied force F"

$F= ke$

where F= applied force

k= spring constant

e= extension

Given data

length of string l = 16cm

extension e = 20-16= 4cm

applied force = 5N

we need t o first calculate the spring constant k

apply the formula

$F= ke$

$5=k*4\\k= \frac{5}{4} \\k= 1.25N/cm$

we can now calculate the extension of the string when supporting a 6N weight

$F= ke\\6=1.25*e\\e= \frac{6}{1.25} \\e= 4.8cm$

The length of the string when supporting a 6N weight is

$= length+ extension\\= 16+4.8\\= 20.8cm$

<em>COMMENT </em><em>:According to the analysis an extra weight of 1N will cause add 0.8cm to the length of the string</em>

4 0

3 years ago

Element X is a radioactive isotope such that every 82 years, its mass decreases by half. Given that the initial mass of a sample

lesantik [10]

Answer: 17 years

Explanation:

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

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

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$k=\frac{0.693}{82years}=8.4\times 10^{-3}years^{-1}$

b) for 8900 g of the mass of the sample to reach 7700 grams

$t=\frac{2.303}{8.4\times 10^{-3}}\log\frac{8900}{7700}$

$t=17years$

Thus it will take 17 years

4 0

3 years ago

In two or more complete sentences describe how a constant pressure calorimeter can be made, and how it is used to measure energy

Stella [2.4K]

<span>Heat capacity is the ratio of the amount of heat energy transferred to an object to the resulting increase in its temperature. Molar heat capacity is a ..... Data collected during a constant-pressure calorimetry experiment can be used to calculate the heat capacity of an unknown substance</span>