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adelina 88 [10]

3 years ago

12

Which of the following statements about hydrogen peroxide (H2O2) and water (H2O) correctly describe their properties?

1 answer:

Zielflug [23.3K]3 years ago

8 0

I am not 100% sure but I think is C.

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castortr0y [4]

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6 0

3 years ago

Why is it suggested you use weighing paper or a watch glass instead of filter paper on which to allow a sample to dry? please gi

snow_lady [41]

The suggestion is to prevent a puddle of the liquid present in the sample from forming or from it leaking on to the surface on which it is placed. For example, if precipitates of a solid are removed from water and then placed on filter paper to dry, the water will soak into the filter paper and then leak on to the counter on which it is placed. If this precipitate were placed in a watch glass or weighing paper, the water would only evaporate and would not contaminate the sample.

5 0

3 years ago

What is the mass of 1.7 × 1023 atoms of zinc (Zn)?

Rudiy27

Number of moles is defined as the ratio of given mass in g to the molar mass.

The mathematical formula is:

Number of moles = $\frac{given mass in g}{molar mass}$ (1)

Number of zinc atoms is equal to $1.7\times10^{23}$ , by Avogadro number, number of moles can be calculated.

As, 1 mol= $6.022\times10^{23}$ atoms, hence,

$1.7\times10^{23}\times\frac{1 mol}{6.022\times10^{23} }$

= 0.2822 mol

Now, from formula (1), calculate mass in g (molar mass of zinc = 65.4 g/mol)

0.2822 mol = $\frac{mass in g}{65.4 g/mol}$

mass in g = ${0.2822 mol \times 65.4 g/mol$

= 18.45588 g

Thus, by rounding off the above number, it will come near about 19 g approximately.

Hence, option (C) is the correct answer.

8 0

3 years ago