ДаНо:
<span>n(P2O5) = 3, 8 моль</span>
<span>Найти: m(P2O5)</span>
Решение:
<span><span>m = n </span>∙ M</span>
<span>M (P2O5) = 31 ∙2 + 16∙5 = 142
г\моль</span>
<span>m(P2O5)= 142 г\моль\
3,8 моль = 539,6 г</span>
<span>ответ: m(P2O<span>5)= 539,6 г</span></span>
[10⁻¹⁰ₓ10⁻ˣ]=10⁻¹⁴ x=4 Ph=4
<span><span><span>67Br
</span></span><span><span>68Br
</span></span><span><span>69Br
</span></span><span><span>70Br
</span></span><span><span>71Br
</span></span><span><span>72Br
</span></span><span><span>73Br
</span></span><span><span>74Br
</span></span><span><span>75Br
</span></span><span><span>76Br
</span></span><span><span>77Br
</span></span><span><span>78m
</span></span><span><span>79Br
</span></span><span><span>80Br
</span></span><span><span>81Br
</span></span><span><span>82Br</span>3
</span><span><span>83Br
</span></span><span><span>84Br
</span></span><span><span>85Br
</span></span><span><span>86Br
</span></span><span><span>87Br
</span></span><span><span>88Br
</span></span><span><span>89Br
</span></span><span><span>90Br
</span></span><span><span>91Br
</span></span><span><span>92Br
</span></span><span><span>93Br
</span></span><span><span>94Br
</span></span><span><span>95Br
</span></span><span><span>96Br
</span></span><span><span>97Br
</span></span><span>98Br</span></span>
1)1,.................................